Allow service alias from config in Docker executor

What does this MR do?

Allows service alias from config in Docker executor

Why was this MR needed?

Some people may need to alias a service within the Runner config to make it easier to enforce service includes.

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• master - branch was rebased to get the latest pipeline updates

What are the relevant issue numbers?

Closes #4114 (closed)