Add ability to skip build on deploy-review command

[nepalevov]

Name and Version

any

What is the problem this feature will solve?

Pretty often, there's no need to rebuild code for the review environment deployment. Especially when subsequent runs with changes that will 100% not affect anything, and basically, the slash command was triggered to re-run tests.

However, we still have to wait up to 20 minutes for the container image to be built.

What is the feature you are proposing to solve the problem?

1. On the GitLab side, implement some basic checksum verification as a criterion to skip the container image build
2. On the GitHub side, support an additional named argument for the slash command to enforce this skip

What alternatives have you considered?

No response