build: repopulate TypeMeta after client.Get to avoid event recorder nil deref

[SAY-5]

Fixes #6587.

After PR #6492 migrated the build controller from record.EventRecorder to events.EventRecorder, every event publish went through reference.GetReference(scheme, obj) which calls obj.GetObjectKind(). controller-runtime strips TypeMeta from objects returned by client.Get (kubernetes-sigs/controller-runtime#1735), so GetObjectKind() nil-derefs and the build controller panics on every reconcile.

Repopulate TypeMeta immediately after client.Get returns. The same pattern likely affects the pipe, integration, integrationkit, integrationplatform, and catalog controllers (all migrated to events.EventRecorder); happy to send a sibling PR if you'd like the sweep, but filing Build alone first per the issue scope.

[squakez]

Thanks for looking at it. We have already discussed the solution in #6589 - this particular case is likely going to affect also the other controllers. We'll fix it bringing back the object specific event funcs.

[SAY-5]

Closing in favor of #6589 — thanks @squakez!