Use shared initial passord and license secrets for all Review Apps

What does this MR do?

This make sure we use only 2 shared secrets for the initial password and the GitLab license for all Review Apps instead of creating separate secrets for each new Review App.

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Closes #37259 (closed).