Upgrade from AppWrapper v1beta1 to v1beta2

[dgrove-oss]

Issue link

What changes have been made

Context: This PR supports the migration of the codeflare operator from MCADv1 to Kueue+AppWrapper. We should probably wait on merging this PR until the corresponding PRs on the consuming codeflare repos are ready, as the removal of MCADv1 CRDs is a breaking change.

Change summary

1. Replace MCAD dependency with AppWrapper
2. Upgrade AppWrapper from v1beta1 to v1beta2
3. Upgrade to go 1.21
4. Upgrade go dependencies to match Kueue/AppWrapper requirements
5. Fix bug in fakeclient initialization (dynamic interface not initialized)

Verification steps

I manually ran go test ./support/. -v

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • [ x ] Unit tests
  • Manual tests
  • Testing is not required for this change

[openshift-ci]

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[dgrove-oss]

Meant to use the branch in the codeflare repo; not my fork. Closing and will recreate a new one.