ci: add path filters to skip KinD e2e on unrelated changes

[Ankitsinghsisodya]

Summary

• Adds paths filters to the pull_request trigger in kind-e2e.yaml
• The KinD e2e matrix (3 test suites × 2 k8s versions) currently fires on every PR regardless of what changed; restricting it to paths that can actually affect runtime behaviour avoids wasting ~6 parallel runner-hours on documentation or tooling-only PRs

Paths that trigger the workflow:

• **/*.go — any Go source change
• go.mod / go.sum — dependency changes
• config/** — Knative config YAMLs
• test/** — test helpers and fixtures
• .github/workflows/kind-e2e.yaml — the workflow file itself

Note: e2e-tests is not a required status check on this repo (Prow handles gating via conformance-tests_eventing_main etc.), so a skipped run on docs-only PRs does not block merging.

Test plan

• Confirm e2e workflow is skipped for a docs-only PR
• Confirm e2e workflow runs for a PR touching .go files

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Ankitsinghsisodya
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[knative-prow]

Hi @Ankitsinghsisodya. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds path-based filtering to the KinD e2e GitHub Actions workflow so it only runs on PRs that change runtime-relevant files, reducing unnecessary CI usage.

Changes:

• Add paths filters to the pull_request trigger for the KinD e2e workflow
• Restrict workflow execution to Go sources, Go deps, config, tests, and the workflow file

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.48%. Comparing base (7c4c338) to head (953a82d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9045      +/-   ##
==========================================
- Coverage   50.51%   50.48%   -0.03%     
==========================================
  Files         409      409              
  Lines       27505    27505              
==========================================
- Hits        13894    13887       -7     
- Misses      12749    12756       +7     
  Partials      862      862              

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