Add logic to convert the status of a Build and BuildRun from Beta to Alpha

[SaschaSchwarze0]

Changes

When we delivered the Beta API in v0.12, we assumed that we do not require conversion logic for the status of Build and BuildRun from Beta to Alpha, because only the controller would ever set a status - and they run on alpha.

While this was true, you can still erase the status by running a command like this:

$ kubectl patch buildrun <BUILDRUN> --type merge -p '{"metadata":{"annotations":{"test":"value"}}}'

After running this for a completed BuildRun, its status is gone.

This PR takes the conversion logic that was planned to go out in this PR into a separate pull request and adds unit test cases.

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

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Release Notes

You can now patch a completed BuildRun on the Beta API without removing its status

[HeavyWombat]

/lgtm
/approve

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