#1981: fix ide update failing on windows arm64

[cap-juan]

This PR fixes #1981

Implemented changes:

• Added a fallback from windows-arm64 to windows-x64 when no native Windows ARM64 snapshot artifact is available.
• Added snapshot metadata inspection to verify which platform classifiers are actually published.
• Added short-term caching for Maven metadata to avoid downloading and parsing the same maven-metadata.xml multiple times.
• Kept the fallback limited to Windows ARM64 so that Linux and macOS artifact resolution remain unchanged.
• Added tests covering the ARM64 fallback, existing ARM64 artifacts, unsupported classifiers, and snapshot-version resolution.

Testing instructions

1. Run the focused Maven repository tests:
   mvn -pl cli -Dtest=MvnRepositoryTest test

2. Run the complete test suite:
   mvn clean test

3. Build and install the modified IDEasy version locally:
   ./build-local-dev.sh

4. Open a new PowerShell session and simulate Windows ARM64:
   $env:IDE_OPTIONS = "-Dos.arch=arm64"

5. Verify the simulated architecture:
   ide status

6. Run the previously failing snapshot upgrade:
   ide upgrade --mode=snapshot

7. Verify that IDEasy falls back to the windows-x64 artifact instead of failing with a 404 for windows-arm64.

8. Remove the architecture override after testing:
   Remove-Item Env:IDE_OPTIONS -ErrorAction SilentlyContinue

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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.
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  with internal
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Checklist for tool commandlets

Have you added a new «tool» as commandlet? There are the following additional checks:

• The tool can be installed automatically (during setup via settings) or via the commandlet call
• The tool is isolated in its IDEasy project, see Sandbox Principle
• The new tool is added to the table of tools in LICENSE.asciidoc
• The new commandlet is a command-wrapper for «tool»
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• The new commandlet installs potential dependencies automatically
• The variables «TOOL»_VERSION and «TOOL»_EDITION are honored by your commandlet
• The new commandlet is tested on all platforms it is available for or tested on all platforms that are in scope of the linked issue

[coveralls]

Coverage Report for CI Build 31469913795

Coverage increased (+0.02%) to 72.9%

Details

• Coverage increased (+0.02%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 39 coverage regressions across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

39 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/tool/mvn/MvnRepository.java	39	73.77%

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Coverage Stats

Relevant Lines:	17599
Covered Lines:	13381
Line Coverage:	76.03%
Relevant Branches:	7777
Covered Branches:	5118
Branch Coverage:	65.81%
Branches in Coverage %:	Yes
Coverage Strength:	3.23 hits per line

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💛 - Coveralls