docs: adding general rules to e2e contribution guidelines

[nilgaar]

Description

Adding some general rules that I think are relevant.

Which issue(s) does this PR fix

• Fixes https://issues.redhat.com/browse/RHIDP-4243

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[subhashkhileri]

/ok-to-test

[subhashkhileri]

/lgtm

[josephca]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: josephca, subhashkhileri

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