Move pipelinespec functions into a separate package

[JeromeJu]

Changes

Moves the GetPipelineFunc and GetPipelineData to its own package
as previously the resources package has been doing too much.
No functional changes.

Part of #5024

/kind cleanup

Submitter Checklist

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

• n/a Docs included if any changes are user facing
• n/a Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been filled in
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Release Notes

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[tekton-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[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/pipeline/pipelinespec.go	Do not exist	100.0%

[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/pipeline/pipelinespec.go	Do not exist	100.0%

[lbernick]

thanks Jerome! maybe pipelinespec could be a more descriptive package name?

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lbernick

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[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/pipelinespec/pipelinespec.go	Do not exist	100.0%

[JeromeJu]

thanks Jerome! maybe pipelinespec could be a more descriptive package name?

Thank you Lee for the comment. Changed to pipelinespec and retested.

[dibyom]

/lgtm