Add conversion for v1 TaskRun

[JeromeJu]

Changes

This commit adds conversion functions between v1beta1 and v1 TaskRun. It does not handle fields deprecated in v1beta1 that will not be present in v1. It implements ConvertTo and ConvertFrom for v1beta1 TaskRun, and leaves these functions unimplemented for v1 TaskRun, since it is the highest known version.

needs #5272

Part of #4985 /kind misc

Submitter Checklist

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

• [n/a] Has Docs included if any changes are user facing
• [x] Has Tests included if any functionality added or changed
• [x] Follows the commit message standard
• [x] Meets the Tekton contributor standards (including functionality, content, code)
• [x] Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• [n/a] Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• [n/a] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[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]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lbernick

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• ~~pkg/apis/OWNERS~~ [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/apis/pipeline/v1/taskrun_conversion.go	Do not exist	66.7%

[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/apis/pipeline/v1/taskrun_conversion.go	Do not exist	66.7%
pkg/apis/pipeline/v1beta1/taskrun_conversion.go	66.7%	96.0%	29.4

[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/apis/pipeline/v1/taskrun_conversion.go	Do not exist	66.7%
pkg/apis/pipeline/v1beta1/taskrun_conversion.go	66.7%	96.0%	29.4

[dibyom]

/lgtm