Match axe findings by rule and report all failing elements

[kzhou314]

Closes https://github.com/github/accessibility/issues/10754

Axe findings were fingerprinted on a single element's exact HTML, so a small DOM shift changed the key and re-filed issues that were already tracked. Instead, we match axe findings by url + ruleId instead of HTML, so re-scans re-link to the existing issue even when surrounding markup changes. Moreover, we capture every element that fails a rule (not just the first) and list them all in the issue body.

[Copilot]

Pull request overview

This PR improves how accessibility scan findings (especially axe violations) are correlated to existing GitHub issues by using a more stable identity (url + ruleId) and expands reporting so a single rule-level issue can include all failing elements on a page.

Changes:

• Add nodes to axe findings to capture all elements failing a given axe rule.
• Update filing/matching logic so axe findings are keyed by url + ruleId rather than element HTML.
• Update issue body generation and tests to list multiple failing elements for a rule.

Show a summary per file

File	Description
tests/types.d.ts	Extends test-side Finding typing to include per-finding nodes.
tests/site-with-errors.test.ts	Adds assertions ensuring axe findings include populated nodes aligned with finding.html.
.github/actions/find/tests/findForUrl.test.ts	Adds coverage ensuring axe violations capture all failing nodes into Finding.nodes.
.github/actions/find/src/types.d.ts	Extends action Finding typing to include FindingNode[].
.github/actions/find/src/findForUrl.ts	Populates Finding.nodes from axe violation nodes during scanning.
.github/actions/file/tests/updateFilingsWithNewFindings.test.ts	Adds tests verifying axe findings remap to existing issues despite HTML shifts.
.github/actions/file/tests/generateIssueBody.test.ts	Adds test asserting issue bodies list every failing node when present.
.github/actions/file/src/updateFilingsWithNewFindings.ts	Updates axe finding keying to be rule-level (url + ruleId).
.github/actions/file/src/types.d.ts	Extends filing-side Finding typing to include per-finding nodes.
.github/actions/file/src/generateIssueBody.ts	Refactors “What” section generation to list all failing nodes when available.

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• Files reviewed: 7/10 changed files
• Comments generated: 2