kt: Introduce kt checkout/vm for rlc kernels

[roxanan1996]

Similar to current implementation for the lts kernels, except for 2 changes:

1. source tree branch changes for rlc when a new version is released, hence we cannot lock a specific version in kernels.yaml file. Instead a pattern is used. And when kt checkout is used, the latest branch that matches the pattern is found and used.
2. if a new minor rocky version is released, qcow images are usually published later. Hence the url for a specific rocky linux won't work. As a temporary solution, the latest qcow image is used for a major version.

[Copilot]

Pull request overview

Introduces support for RLC kernel workspaces by adding a kernel “type” concept, selecting the newest matching source-tree branch at checkout time, and switching VM image download base URLs to use Rocky’s public mirror for RLC.

Changes:

• Add kernel_type metadata to kernel definitions and introduce a KernelType enum.
• For RLC kernels, resolve src_tree_branch patterns (with X.Y placeholders) to the newest matching remote branch during workspace load.
• Use a different Rocky Linux base URL for RLC VM qcow2 downloads.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
kt/ktlib/vm.py	Selects VM image base URL depending on kernel type.
kt/ktlib/util.py	Adds an RLC-specific Rocky download base URL constant.
kt/ktlib/kernels.py	Introduces KernelType and adds kernel_type to KernelInfo.
kt/ktlib/kernel_workspace.py	Adds RLC-aware branch resolution and worktree update behavior.
kt/data/kernels.yaml	Adds kernel_type fields and new RLC kernel entries with branch patterns.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.