fix: Remove RHEL Build Requirement for Rust

[Tonisal-byte]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

Disables rust-toolset build requirement

Change Log

• Added rust component toml

Does this affect the toolchain?

It does not.

Test Methodology

Successfully completed builds on stable koji deployment.

[Copilot]

Pull request overview

This PR moves Rust customization into a dedicated component file and disables the RHEL-specific rust-toolset build requirement via an overlay, aligning with the repo’s pattern of putting customized components under their own directories.

Changes:

• Added a base/comps/rust/rust.comp.toml component definition with a spec overlay that removes %{?rhel:BuildRequires: rust-toolset}.
• Removed the inline [components.rust] entry from base/comps/components.toml (now sourced via includes = ["**/*.comp.toml"]).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
base/comps/rust/rust.comp.toml	Defines the Rust component overlay to remove the RHEL-only rust-toolset BuildRequires line.
base/comps/components.toml	Drops the old components.rust stub entry since Rust is now defined via the included .comp.toml.

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[reubeno]

Let's hold off merging this until we can sort out whether the surgical overlay here is the Right fix to make.

[reubeno]

While this gets it to build, what's the impact of enabling all of the other blocks in the .spec conditional on rhel being defined (and/or a certain value)?

Let's sort out if the correct decision is to ensure that rhel is undefined for this spec. If that's the right call, we may need a new way to express that via the TOML files.