Add pages for StepActions

[AlanGreene]

Changes

Resolves https://github.com/tektoncd/dashboard/issues/3348

Add list and details pages for the v1alpha1 StepActions resources following the same pattern as the existing Tasks / Pipelines page. The only difference is that we don't link to associated runs or provide the ability to create a run as a StepAction must be used in a Task and cannot be run standalone.

/kind feature

Submitter Checklist

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

• [ ] Docs included if any changes are user facing
• [ ] Tests included if any functionality added or changed
• [ ] Follows the commit message standard
• [ ] Meets the Tekton contributor standards (including functionality, content, code)
• [ ] 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
• [ ] Release notes block below has been updated with any user facing changes (new features, significant UI changes, API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• [ ] 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]

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[tekton-robot]

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[AlanGreene]

/test all

[AlanGreene]

StepActions was added in Pipelines v0.54.0 and is currently alpha. It is expected to be promoted to beta around the v0.60.0 / June timeframe.

The latest Dashboard release (v0.45.0) still supports Pipelines v0.53.0, so we might wait until we drop support for that before landing this change.

[AlanGreene]

/test all

[tekton-robot]

@AlanGreene: PR needs rebase.

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[AlanGreene]

Once https://github.com/tektoncd/dashboard/pull/3465 and the follow-up PR to refactor the common containers are merged this PR will become a lot simpler, essentially just defining the route. All of the API layer, list / details containers, etc. will use the common code instead of custom stuff.

[AlanGreene]

Replaced by https://github.com/tektoncd/dashboard/pull/3490