MTV-1596 | Add new VolumeNameTemplate field to plan CR

[yaacov]

Ref:
https://issues.redhat.com/browse/MTV-1596

RFE:
Requesting the ability for choosing a custom name for the network and disks during migration for VM's. Currently migrations end up with 'net-0' or 'vol-1' and cannot be modified. A newly created vm typically allows for you to name these.

Fix:
Add an optional network template:

 VolumeNameTemplate is a template for generating volume interface names in the target virtual machine.
 It follows Go template syntax and has access to the following variables:
   - .PVCName: name of the PVC mounted to the VM using this volume
   - .VolumeIndex: sequential index of the volume interface (0-based)
 Note:
   - This template can be overridden at the individual VM level
   - If not specified on VM level and on Plan leverl, default naming conventions will be used
 Examples:
   "disk-{{.VolumeIndex}}"
   "pvc-{{.PVCName}}"

In the plan YAML:

spec:
   ...
   volumeNameTemplate:  "disk-{{.VolumeIndex}}"

   vms:
    - name: some-vm
      volumeNameTemplate:   "pvc-{{.PVCName}}"

Screenshots:

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Codecov Report

Attention: Patch coverage is 0% with 118 lines in your changes missing coverage. Please review.

Project coverage is 15.26%. Comparing base (f1fe5d0) to head (9138f56).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/plan/validation.go	0.00%	66 Missing ⚠️
pkg/controller/plan/adapter/vsphere/builder.go	0.00%	52 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1332      +/-   ##
==========================================
- Coverage   15.45%   15.26%   -0.19%     
==========================================
  Files         112      112              
  Lines       23377    23617     +240     
==========================================
- Hits         3613     3606       -7     
- Misses      19479    19724     +245     
- Partials      285      287       +2     

Flag	Coverage Δ
unittests	15.26% <0.00%> (-0.19%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[yaacov]

@mnecas hi, rebased and added a log line for template failing case

[mnecas]

lgtm