workaround rust-nix* test failures due to 4-part kernel version issue

[christopherco]

Azure Linux 3.0 kernels, used on our current Koji builders, have 4-part
version strings (e.g. 6.6.121.1-1.azl3) which the semver crate's
Version::parse() rejects. Two tests (gro, gso) panic on unwrap of the
parse error.

Apply the same fix-4part-kernel-version.patch already used by rust-nix:
truncate to 3 numeric components before parsing so the extra part
becomes a pre-release suffix (which is cleared immediately after).

Apply to rust-nix0.23, rust-nix0.28, rust-nix0.29, rust-nix0.30.

This workaround can be undone when the Koji builders move to a
kernel with 3-part version strings, although the current logic will still
continue to function as intended with a standard 3-part kernel version
string.

[Copilot]

Pull request overview

Adds Azure Linux–specific overlays to multiple rust-nix* component variants to prevent %check panics on Koji builders running AZL3 kernels that report a 4-part uname -r version string (rejected by semver::Version::parse()), aligning these variants with the already-established workaround used elsewhere in the repo.

Changes:

• Add per-component overlays for rust-nix0.23, rust-nix0.28, rust-nix0.29, and rust-nix0.30 to ship and register fix-4part-kernel-version.patch.
• Introduce the patch in each component directory to rewrite the kernel version string into semver-parseable form for the affected tests.
• Remove these components’ bare entries from components-full.toml now that they have dedicated *.comp.toml definitions.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
base/comps/rust-nix0.30/rust-nix0.30.comp.toml	Adds overlays to include/register the kernel-version parsing workaround patch.
base/comps/rust-nix0.30/fix-4part-kernel-version.patch	Implements semver-compatible handling for 4-part uname -r strings in test helper code.
base/comps/rust-nix0.29/rust-nix0.29.comp.toml	Same overlay approach for the 0.29 variant.
base/comps/rust-nix0.29/fix-4part-kernel-version.patch	Same patch content for the 0.29 variant.
base/comps/rust-nix0.28/rust-nix0.28.comp.toml	Same overlay approach for the 0.28 variant.
base/comps/rust-nix0.28/fix-4part-kernel-version.patch	Same patch content for the 0.28 variant.
base/comps/rust-nix0.23/rust-nix0.23.comp.toml	Same overlay approach for the 0.23 variant.
base/comps/rust-nix0.23/fix-4part-kernel-version.patch	Same patch content for the 0.23 variant.
base/comps/components-full.toml	Removes entries for components that now have dedicated *.comp.toml files.

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[binujp]

Looks good to me. We probably will ever know why they did not use a regular expression.