Retrieve the commit SHA as the reference for pull requests

[dejan-lukic]

The qlty.sh api does not yield coverage results for references in the format refs/pull/{number}.

This PR instead retrieves the commit SHA for the currently viewed PR via the Changes from... element (see screenshot) on the page. Alternatively, we could (and probably should) use a more robust method to retrieve the SHA, e.g. via the GitHub API

[Copilot]

Pull Request Overview

This PR enhances reference resolution by first attempting to extract the current pull request’s commit SHA from the page’s details-menu and falling back to URL-based refs, and updates the coverage loader to use the new reference parameter.

• Introduce getRef, getPullRequestCommitSha, and getRefFromUrl to resolve the correct Git reference
• Update loadCoverageForPath to pass the resolved ref into readCoverageData
• Change readCoverageData signature to accept an explicit reference and remove inline URL parsing

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/github.ts	Add commit SHA extraction, URL fallback logic, and ref lookup
src/api.ts	Update readCoverageData to take a reference parameter

Comments suppressed due to low confidence (1)

src/github.ts:13

• [nitpick] Add unit tests for the new getRef, getPullRequestCommitSha, and getRefFromUrl functions to verify correct behavior across different page states (e.g., PR view, commit view, and non-PR pages).

function getRef() {

[CLAassistant]

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