Add validations to DatadogDashboardSpec

[shuheiktgw]

What does this PR do?

Add validations to DatadogDashboardSpec.

Motivation

The same with #1694, but for DatadogDashboardSpec.

Additional Notes

N/A

Minimum Agent Versions

N/A

Describe your test plan

I've tested it locally with the following two manifests.

$ cat missing.yaml
apiVersion: datadoghq.com/v1alpha1
kind: DatadogDashboard
metadata:
  name: example-dashboard
  namespace: system
spec:
  # title: test
  # layoutType: ordered
  tags:
    - "team:tagtest"
  templateVariables:
    - availableValues:
        - host1
        - host2
        - host3
      name: first
      prefix: bar-foo
  notifyList:
    - [email protected]
  widgets: '[{
            "id": 2639892738901474,
            "definition": {
                "title": "",
                "title_size": "16",
                "title_align": "left",
                "show_legend": true,
                "legend_layout": "auto",
                "legend_columns": [
                    "avg",
                    "min",
                    "max",
                    "value",
                    "sum"
                ],
                "type": "timeseries",
                "requests": [
                    {
                        "formulas": [
                            {
                                "formula": "query1"
                            }
                        ],
                        "queries": [
                            {
                                "name": "query1",
                                "data_source": "metrics",
                                "query": "avg:system.cpu.user{*} by {host}"
                            }
                        ],
                        "response_format": "timeseries",
                        "style": {
                            "palette": "dog_classic",
                            "order_by": "values",
                            "line_type": "solid",
                            "line_width": "normal"
                        },
                        "display_type": "line"
                    }
                ]
            },
            "layout": {
                "x": 0,
                "y": 0,
                "width": 4,
                "height": 2
            }
         }]'

$ k apply -f missing.yaml
The DatadogDashboard "example-dashboard" is invalid:
* spec.layoutType: Required value
* spec.title: Required value

$ cat empty.yaml
apiVersion: datadoghq.com/v1alpha1
kind: DatadogDashboard
metadata:
  name: example-dashboard
  namespace: system
spec:
  title: ""
  layoutType: ""
  tags:
    - "team:tagtest"
  templateVariables:
    - availableValues:
        - host1
        - host2
        - host3
      name: first
      prefix: bar-foo
  notifyList:
    - [email protected]
  widgets: '[{
            "id": 2639892738901474,
            "definition": {
                "title": "",
                "title_size": "16",
                "title_align": "left",
                "show_legend": true,
                "legend_layout": "auto",
                "legend_columns": [
                    "avg",
                    "min",
                    "max",
                    "value",
                    "sum"
                ],
                "type": "timeseries",
                "requests": [
                    {
                        "formulas": [
                            {
                                "formula": "query1"
                            }
                        ],
                        "queries": [
                            {
                                "name": "query1",
                                "data_source": "metrics",
                                "query": "avg:system.cpu.user{*} by {host}"
                            }
                        ],
                        "response_format": "timeseries",
                        "style": {
                            "palette": "dog_classic",
                            "order_by": "values",
                            "line_type": "solid",
                            "line_width": "normal"
                        },
                        "display_type": "line"
                    }
                ]
            },
            "layout": {
                "x": 0,
                "y": 0,
                "width": 4,
                "height": 2
            }
         }]'

$ k apply -f empty.yaml
The DatadogDashboard "example-dashboard" is invalid:
* spec.layoutType: Unsupported value: "": supported values: "ordered", "free"
* spec.title: Invalid value: "": spec.title in body should be at least 1 chars long

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.33%. Comparing base (0cc6abb) to head (b016472).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1704   +/-   ##
=======================================
  Coverage   49.33%   49.33%           
=======================================
  Files         219      219           
  Lines       21314    21314           
=======================================
  Hits        10515    10515           
  Misses      10252    10252           
  Partials      547      547           

Flag	Coverage Δ
unittests	49.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0cc6abb...b016472. Read the comment docs.