tests/runc: 13 skipped tests in runc_test_pattern already pass #3843

Background

tests/runc/runc_test_pattern keeps 13 entries marked [skip] with no reason
comment, but all of them pass against the current main build. The list looks
stale: youki gained support for these cases at some point and the entries were
never re-enabled.

This is independent of #3834, which unskips a different set of entries after
changing the process.terminal default of youki spec.

Tests

• empty HOME env var is overridden
• empty HOME env var is overridden with multiple overrides
• runc run no capability
• runc run with some capabilities
• runc run with new privileges
• runc run with RLIMIT_NOFILE(The same as system's hard value)
• runc run [/proc is a symlink]
• runc run [redundant default /dev/tty]
• runc run [ro /sys/fs/cgroup mounts + cgroupns]
• runc run [tmpcopyup]
• runc run [simple timens]
• runc run [simple timens + userns]
• runc run [timens with no offsets]

TODO

• Drop the [skip] prefix from the entries above
• Confirm just test-runc-comp still passes

Verification

Ran each entry through just test-runc-comp (i.e. including the script
wrapper) against a main build. All 13 reported ok.
Environment: Fedora 42, aarch64, cgroup v2 unified, runc submodule at
b04031d7. Not verified on x86_64.

Related

• set process.terminal to true in youki spec to match runc #3834