Allow to skip check-plugins-build / validate check with ci/skip-validate-plugins label

[Copilot]

Summary

Fixes #10135

Adds label-based skip support for the check-plugins-build / validate workflow check, matching the existing pattern used for e2e tests.

Occurred changes and/or fixed issues

• Added if condition to the validate job in .github/workflows/check-plugins.yaml that checks for ci/skip-validate-plugins label
• When label is present on a PR, the check is skipped

Technical notes summary

Uses the same pattern as existing ci/skip-e2e label in test.yaml:

if: "!contains( github.event.pull_request.labels.*.name, 'ci/skip-validate-plugins')"

Areas or cases that should be tested

• Create a PR with ci/skip-validate-plugins label → validate job should be skipped
• Create a PR without the label → validate job should run normally

Areas which could experience regressions

None - this is an additive change to workflow conditional logic.

Screenshot/Video

N/A - CI workflow change only

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
• The PR has been reviewed in terms of Accessibility
• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Allow to skip check-plugins-build / validate check</issue_title>
<issue_description># Description

Allow to skip the check for check-plugins-build / validate using label ci/skip-validate-plugins.

After the episode of multiple failing checks, it seems convenient to have a similar label to omit checks in case of undoubtedly certain issues in the workflow.
</issue_description>

Comments on the Issue (you are @copilot in this section)

@codyrancher Here's an example of workflows using labels for skipping a check https://github.com/rancher/dashboard/blob/master/.github/workflows/scripts/pr-gh-project.js#L275-L278 @cnotv We have the E2E using labels since long https://github.com/rancher/dashboard/blob/master/.github/workflows/test.yaml#L40

Your code seems using env var instead or?</comment_new>
<comment_new>@codyrancher

We have the E2E using labels since long https://github.com/rancher/dashboard/blob/master/.github/workflows/test.yaml#L40

Your code seems using env var instead or?

I'm happy if either is done. The QA_NONE was the label checking I was aware of so I linked it just in case someone takes the issue they won't have to dig into it.</comment_new>

• Fixes Allow to skip check-plugins-build / validate check #10135

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