Beta features in V1 for Integration and Examples Test

[JeromeJu]

Feature request

The beta feature in V1 needs to be specified. The respective flag values and directories need to be updated.

• feature flag table & gates
• plumbing for beta feature tests

(please feel free to edit if missing)

Use case

In #5579 , the integration tests for bundle conversion to resolver needs beta/ alpha feature flags to be set.

For example, the following tests are failing in v1 examples without feature flags for non-alpha integration test.
https://prow.tekton.dev/view/gs/tekton-prow/pr-logs/pull/tektoncd_pipeline/5579/pull-tekton-pipeline-integration-tests/1587456476048265216

[JeromeJu]

/assign

[JeromeJu]

Thanks to the pointers from Dibyo, our existing pull-tekton-pipeline-alpha-integration-tests could run with beta flags set.
Does it makes sense to ask the question 'Will this lead to the creation of beta-integration test'?
cc @lbernick @dibyom

Currently trying to figure out the prow env for .examples/v1beta1/pipelineruns/alpha

[lbernick]

I think this is a duplicate of #5734?