fix: increase retry period for validate_profile_deployments_with_custom_images

[mvlassis]

Summary

• Increase the timeout for the validate_profile_deployments_with_custom_images function to 90 seconds for both test_charm and test_charm_ambient

Notes

Because the metacontroller's resyncPeriodSeconds is 60 seconds, that means that it can theoretically take up to 60 seconds for the sync.py hook to be triggered. I added 30 seconds for buffer, since this won't affect successful runs

Closes #951

[ckfbot]

🤖 Backport labels populated

Labels to this pull request were added automatically by the populate-labels.yaml action.

When the PR is merged, backport PRs according to the labels will be automatically created. To skip the backport creation, remove any unneeded labels before merging the PR.