Make SAST, Dependency Scanning QA compatible

Add suffixes to .qa and .update-qa so that Dependency Scanning QA doesn't conflict with SAST QA.

Also, set default values for WANT and GOT, to make definition of QA, update QA jobs shorter.

See gitlab-org/gitlab#212345 (closed)

Tested in https://gitlab.com/gitlab-org/security-products/tests/ruby-bundler/pipelines/129309473, see gitlab-org/security-products/tests/ruby-bundler!78 (merged)

Regression test in https://gitlab.com/gitlab-org/security-products/tests/ruby-bundler/pipelines/129307552