Quarkus 3 Migration: Push to main should handle rebase before push if needed

[radtriste]

The nightly run of Quarkus 3 Migration is checking out all repositories and then proceeding with quarkus 3 migration updates.
Issue is that by the time it reaches, for example, kogito runtimes migration updates, some changes may have been done on the main branch and so, the update of the before.sh patch will fail because the updates cannot be push to main branch anymore.
The script should try to rebase before performing the push.

[radtriste]

working on it