feat: cluster output select dropdown should show meaningful sentence if no options available (backport #1270)

[mergify]

Summary

Display the corresponding message if no matching options are found.

PR Checklist

• Is this a multi-tenancy feature/bug?
  • Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • Yes, the backend owner is:

Related Issue #7305

Occurred changes and/or fixed issues

Add condition this.isSearchable to function showTagPrompts

Areas or cases that should be tested

Go to Rancher
Go to Virtualization Management -> Harvester cluster -> Virtual Machines
Click on Console button

• Go to Logging -> Cluster Flows
• Click Create button and click second tab Outputs
• Click the Cluster Outputs options, it should show Sorry, no matching options.
• Same behavior to create Flows

Screenshot/Video

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This is an automatic backport of pull request #1270 done by [Mergify](https://mergify.com).

[a110605]

Please rebase

[houhoucoop]

@mergify rebase

[mergify]

rebase

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