Add ability to target specific environments

What does this MR do?

Implements functionality and add documentation for QA E2E tests to be able to target individual or multiple environments.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

Multiple specs written for the new functionality.