build: sort Gradle config into more reusable pieces with less redundancy

[jjohannes]

Description:

As preparation to move things into a separate repository. (WiP)

Candidates for separate PRs:

• move:gradle/versions
• move gradle/aggregation and use for consistent resolution
• Publishing, developers.properties, description.txt
• gradle/jdk-version.txt

Related issue(s):

#14255

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for c4b25881	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c4b2588)	Report Missing	Report Missing	Report Missing
Head commit (6289854)	98279	60489	61.55%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#15282)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (jendrik-dev-tmp@c4b2588). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                 @@
##             jendrik-dev-tmp   #15282   +/-   ##
==================================================
  Coverage                   ?   57.91%           
  Complexity                 ?    19519           
==================================================
  Files                      ?     2669           
  Lines                      ?    98462           
  Branches                   ?    10202           
==================================================
  Hits                       ?    57023           
  Misses                     ?    37835           
  Partials                   ?     3604