fix: prevent repeated setting of pipeline name label

[cugykw]

Fixes: #7730

https://github.com/tektoncd/pipeline/issues/7730#issuecomment-1972787379

Prior to this PR, the propagatePipelineNameLabelToPipelineRun function will continuously set the pipeline name label during each reconcile process. This may override the results by the storePipelineSpecAndMergeMeta function. This may cause some remote resource names to not be set correctly.

This commit, when the pipeline name label has been set, the next reconcile will not be reset again.

/kind bug

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [x] Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• [x] Has Tests included if any functionality added or changed
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Release Notes

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[linux-foundation-easycla[bot]]

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• :white_check_mark: login: cugykw / name: yang kewei (d4fd0f0a4545c6bc7cf11c2a317d510eea56cbb6)

[tekton-robot]

Hi @cugykw. Thanks for your PR.

I'm waiting for a tektoncd 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. Regular contributors should join the org to skip this step.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dibyom]

/ok-to-test

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pipelinerun/pipelinerun.go	91.8%	91.8%	0.0

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pipelinerun/pipelinerun.go	91.8%	91.8%	0.0

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-pipeline-go-coverage-df to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pipelinerun/pipelinerun.go	91.8%	91.8%	0.0

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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[chitrangpatel]

/lgtm