Enhance PR template with testing instructions

[laim2003]

This PR fixes

Implemented changes:

• Added section for testing instructions in PR template.

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[coveralls]

Coverage Report for CI Build 25734571853

Coverage increased (+0.05%) to 70.673%

Details

• Coverage increased (+0.05%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	15471
Covered Lines:	11393
Line Coverage:	73.64%
Relevant Branches:	6918
Covered Branches:	4430
Branch Coverage:	64.04%
Branches in Coverage %:	Yes
Coverage Strength:	3.11 hits per line

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💛 - Coveralls

[areinicke]

Looks fine to me. This will probably be quite valuable for future PRs.
I would have probably added the Testing Instructions above the checklist or below the Tool Commandlet checklist but it's fine either way.

[laim2003]

Looks fine to me. This will probably be quite valuable for future PRs. I would have probably added the Testing Instructions above the checklist or below the Tool Commandlet checklist but it's fine either way.

Yeah, good idea. I thought it might make sense to put it in the middle so you dont have to scroll down all the way in case you do not have a PR that requires the commandlet checklist, but honestly the order makes more sense if the testing checklist is in the end