selinux: start the support of install

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

[sylvestre]

Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

Oh, this is unexpected :)

[Copilot]

Pull Request Overview

This PR introduces initial support for SELinux in the install utility by implementing features to preserve and set security contexts during file installation. The key changes include:

• Adding tests for SELinux functionality and updating spell-check hints in the test suite.
• Implementing new SELinux-related functions (contexts_differ and preserve_security_context) in the uucore library.
• Updating the install command to support new flags (-P for preserving context and -Z for setting context) and integrating SELinux functionality into the file copy process.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/by-util/test_install.rs	Updated spell-check hints, removed unimplemented test, added new SELinux tests.
src/uucore/src/lib/features/selinux.rs	Added functions for comparing and preserving SELinux contexts.
src/uu/install/src/install.rs	Integrated SELinux support into install behavior and file operations.
src/uu/install/Cargo.toml	Added selinux feature dependency for install.
Cargo.toml	Added selinux feature activation for install.

Comments suppressed due to low confidence (1)

tests/by-util/test_install.rs:2017

• Verify if the substring 'ailed to set default file creation' is intentional or if it should be corrected to 'failed to set default file creation' to improve clarity.

.stderr_contains("ailed to set default file creation");

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/misc/stdbuf (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

[cakebaker]

Congrats! The gnu test tests/install/install-C-selinux is no longer failing!

Great, good work :)