AOT: fix ZipArchive setArchiveComment/getArchiveComment under thin AOT (#35476)

[PurHur]

Summary

• Route ZipArchive::setArchiveComment / getArchiveComment through dedicated NestedJIT entry points (setArchiveCommentEntry / getArchiveCommentEntry) instead of ZipArchiveJitHelper::exec('sac'/'gac', …).
• Root cause: exec() string formal aliasing under thin AOT dropped the comment payload after setArchiveComment — same class as AOT: ZipArchive::addFromString second call overwrites first entry — archive loses prior files (ext/zip/php_zip.c) #35454 / Fix ZipArchive addFromString AOT entry names (#35454) #35710 (addEntry / replaceEntry splits).
• php-src reference: ext/zip/php_zip.c — zim_ZipArchive_setArchiveComment / zim_ZipArchive_getArchiveComment.

Verification

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

./script/phpunit.sh --filter ZipArchiveArchiveComment35476AotTest
# OK (2 tests, 9 assertions)

./script/docker-exec.sh -- bash -lc 'PHP_COMPILER_ENABLE_ZIP=1 php bin/vm.php test/repro/ziparchive_archive_comment_aot.php'
# empty=false / set=true / get='c' / reopen='c'

./script/docker-exec.sh -- bash -lc 'PHP_COMPILER_ENABLE_ZIP=1 php bin/compile.php -o /tmp/z test/repro/ziparchive_archive_comment_aot.php && /tmp/z'
# same output as VM

Closes #35476

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