handle rate limit exhaustion as configuration error

[nickfyson]

This PR adds a new CliConfigErrorCategory of RateLimitExhausted to the cli-errors module. This will ensure that such errors are treated as configuration errors, and hence not as an indicator of availability with the CodeQL Action.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

[Copilot]

PR Overview

This PR introduces a new error category, RateLimitExhausted, to the cli-errors module so that API rate limit errors are treated as configuration errors.

• Added RateLimitExhausted to the CliConfigErrorCategory enum in both TypeScript and JavaScript files.
• Added regular expression candidates to match rate limit exhaustion error messages in both code paths.

Reviewed Changes

File	Description
src/cli-errors.ts	Added RateLimitExhausted enum value and its regex candidate.
lib/cli-errors.js	Added RateLimitExhausted property and its regex candidate to object.

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