#1822: avoid GitHub redundancies

[MarvMa]

This PR fixes #1822

Implemented changes:

• Centralized GitHub repository/release URL conventions in AbstractGithubUrlUpdater.
• Reused shared helpers in GithubUrlReleaseUpdater and GithubUrlTagUpdater to reduce duplicated URL building.
• Refactored GitHub-based tool updaters to use shared release URL construction instead of manual .../releases/download/... string concatenation.
• Simplified CopilotUrlUpdater by removing redundant GitHub base URL override.
• Updated SquirrelSqlUpdaterTest URL matching and added GithubUrlReleaseUpdaterTest for convention coverage.

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• When running mvn clean test locally all tests pass and build is successful
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[coveralls]

Coverage Report for CI Build 25018284363

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage increased (+0.05%) to 70.689%

Details

• Coverage increased (+0.05%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 1 coverage regression across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/url/tool/squirrelsql/SquirrelSqlUrlUpdater.java	1	84.21%

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Coverage Stats

Relevant Lines:	15337
Covered Lines:	11298
Line Coverage:	73.66%
Relevant Branches:	6846
Covered Branches:	4383
Branch Coverage:	64.02%
Branches in Coverage %:	Yes
Coverage Strength:	3.11 hits per line

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💛 - Coveralls

[satorus]

Sieht gut aus, habe es mit dem copilot updater mal lokal getestet.

Eine Idee war ja, das man gar keine separaten Updater mehr braucht für Github-basierte Tools sondern alles über ein zentrales GithubRepository abhandeln kann. Wenn ich mir das hier so anschaue, scheint das aber schwierig zu werden, da der Asset-Name leider keinen Konventionen folgt :/

[hohwille]

@MarvMa thanks for your PR.
Looks exactly like the simplification and reduction of redundancies I was hoping for.
Nice work. Also thanks for the extra test. 👍
Ready for merge.

[hohwille]

This PR cannot be easily tested e2e. Due to careful review and check of the latest urls updater results, I have set QA approved.