#1884 keep symlinks while unzipping

[satorus]

This PR fixes #1884

Implemented changes:

• Rewrote extractZipWithJava to use ZipFile instead of Java FileSystem. This allows to read symlinks while also allowing to get the POSIX file permissions using File Attributes and Bit-Operations.
• Two-phase symlink extraction: symlink entries are collected during extraction and created only after all regular files are written, matching the existing TAR behaviour.
• Removed extractZipWithSystemUnzip: the Mac-specific workaround that used /usr/bin/unzip is gone. The Java implementation now handles all platforms uniformly.
• Added getZipUnixMode and isZipSymlink helpers: isolate the bit-shifting logic for reading Unix file-type bits from ZIP external attributes, with full Javadoc explaining the bit layout.
• Preserved file permissions via onFileCopiedFromZip using PathPermissions.of(unixMode).toPosix(), skipped on Windows.
• 6 ZIP test resources added covering: basic symlink, reversed entry order, no Unix attributes (Windows ZIP), symlink + executable, symlink to directory, symlink with ../ relative target.
• 12 new test cases in FileAccessImplTest covering: symlink preservation, file permissions, reversed entry order (validates two-phase approach), Windows-created ZIPs, combinations, directory symlinks, relative-parent symlinks, and OS-simulated permission behaviour (Mac and Windows mocks).

How to test:

Difficult. One test is to download and install Terraform and then running terraform --version. This shows that at least the file permissiosn still work. See: #835

For manually checking the unzipping, one can add (@TempDir(cleanup = CleanupMode.NEVER) Path tempDir) to the new test cases. This will create the ideasy-unzipped files in the /tmp/junit-... directories, where one can manually check the unzipped files for correct file permissions and existing symlinks.

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[coveralls]

Coverage Report for CI Build 25723559954

Coverage increased (+0.04%) to 70.659%

Details

• Coverage increased (+0.04%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 192 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

192 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/io/FileAccessImpl.java	191	67.09%
com/devonfw/tools/ide/io/FileCopyMode.java	1	79.31%

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Coverage Stats

Relevant Lines:	15466
Covered Lines:	11394
Line Coverage:	73.67%
Relevant Branches:	6916
Covered Branches:	4421
Branch Coverage:	63.92%
Branches in Coverage %:	Yes
Coverage Strength:	3.12 hits per line

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