JPERF-188: Improve stopJira to wait for Jira process to shutdown inst…

[konradmars]

JPERF-188: Improve stopJira to wait for Jira process to shutdown instead of all Java processes on the node

Renamed branch and commit

Added Changelog entry

[dagguh]

FYI branch name doesn't really matter and the commit message can be amended and force-pushed. You have full permissions and control over your fork.

[dagguh]

Actually, according to myself, it's testable via the existing AwsDatasetModificationIT, which is better, because it directly pertains to dataset manipulations and covers both ends of the CustomDatasetSource - saving and reusing.
We just gotta add the second Java process and again, according to myself it's about using the AtlassianSplunkForwarder.
@KonradMarszalek LMK if you wanna adapt the test. If not, we're attacking this PR with @mzyromski-atlassian anyway, so we can cover that as an exercise.

[konradmars]

@KonradMarszalek LMK if you wanna adapt the test

If possible I leave you to it as I just had coffee-break contribution capacity.

[dagguh]

Awesome, thanks for the fix and the manual test ❤️

[dagguh]

Adopted in #84 with CI