Clean-up logic for overriding proxy

[marcogario]

In #2741, we added this logic due to an issue with the CLI. The CLI has since been fixed and I think it is cleaner to remove this workaround. I am open to hear otherwise and close the PR instead.

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]

Pull Request Overview

This PR removes the workaround for unsetting proxy environment variables from both the TypeScript and JavaScript implementations, as the underlying CodeQL CLI fix makes the workaround unnecessary.

• Removed code that unsets CODEQL_PROXY_* variables in src/analyze-action.ts
• Removed code that unsets CODEQL_PROXY_* variables in lib/analyze-action.js

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/analyze-action.ts	Removed proxy environment variable cleanup as workaround
lib/analyze-action.js	Removed proxy environment variable cleanup as workaround

Comments suppressed due to low confidence (2)

src/analyze-action.ts:204

• Confirm that the removal of proxy environment variable cleanup does not affect workflows that might still expect them to be unset.

// Unset the CODEQL_PROXY_* environment variables, as they are not needed

lib/analyze-action.js:161

• Verify that the removal of this logic in the JavaScript file does not impact any workflows depending on proxy environment variables.

// Unset the CODEQL_PROXY_* environment variables, as they are not needed

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[henrymercer]

Makes sense. Can we gate this behind a version check so that we keep the same behaviour for older CLI versions?