Xattr tests with FUSE-T are broken on CI

[infeo]

Since around September 2025 normal CI builds fail due to failing tests:

• https://github.com/cryptomator/jfuse/actions/runs/21290356808/job/61282028989
• https://github.com/cryptomator/jfuse/actions/runs/18088981928
• etc

It only happens on macOS runners. For testing the FUSE-T library installed via brew is used. The test suite fails on the TestXattr integrations test:

Error:    MirrorIT$TestXattr.testSetxattr:231 Unexpected exception thrown: java.nio.file.FileSystemException: /var/folders/kg/7q73ww8s3llgyl61c9z_j5g40000gn/T/junit-8422338435824566285/mirror/xattr.txt: Error writing extended attribute 'attr1': Operation not permitted
Error:    MirrorIT$TestXattr.testSetxattr:231 Unexpected exception thrown: java.nio.file.FileSystemException: /var/folders/kg/7q73ww8s3llgyl61c9z_j5g40000gn/T/junit-8422338435824566285/mirror/xattr.txt: Error writing extended attribute 'attr2': Operation not permitted
Error:    MirrorIT$TestXattr.testSetxattr:231 Unexpected exception thrown: java.nio.file.FileSystemException: /var/folders/kg/7q73ww8s3llgyl61c9z_j5g40000gn/T/junit-8422338435824566285/mirror/xattr.txt: Error writing extended attribute 'attr3': Operation not permitted
Error:    MirrorIT$TestXattr.testSetxattr:231 Unexpected exception thrown: java.nio.file.FileSystemException: /var/folders/kg/7q73ww8s3llgyl61c9z_j5g40000gn/T/junit-8422338435824566285/mirror/xattr.txt: Error writing extended attribute 'attr4': Operation not permitted
Error:    MirrorIT$TestXattr.testSetxattr:231 Unexpected exception thrown: java.nio.file.FileSystemException: /var/folders/kg/7q73ww8s3llgyl61c9z_j5g40000gn/T/junit-8422338435824566285/mirror/xattr.txt: Error writing extended attribute 'attr5': Operation not permitted

Setting xattr.txt in the source directory of the mirror test fails due to insufficient permissions.

[infeo]

In b9b2a52 I changed the paths for the source and mirror directories. Instead of the JUNIT @TempDir paths the mirror tests created directories in the home folder. But still failing (https://github.com/cryptomator/jfuse/actions/runs/21352528686)