Add separate rules for post-run-e2e-message job

What does this MR do and why?

Adds separate rules for e2e:post-run-e2e-message job to ensure it is only automatically run for code-patterns in merge requests.

The e2e:post-run-e2e-message job is responsible for posting a message on the MR to start e2e test pipeline if selective tests are detected.

When e2e:package-and-test-ee job is auto run, there is no need to post the message. The new rules are based on qa:rules:package-and-test-ee but with when:never in all except for code-patterns in merge requests

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Before	After

How to set up and validate locally

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MR acceptance checklist

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