Distinguish wcag vs best practice

[kzhou314]

Closes #34 (which closes https://github.com/github/accessibility/issues/10749)

Problem

Every finding was filed as if it were a hard WCAG failure, with no way to differentiate definitive violations and best-practice or experimental checks. There was also no way to stop filing the non-WCAG ones.

Changes

• Classify each Axe finding as wcag, best-practice, or experimental
• Surface non-WCAG findings in the filed issue: a "Note: …not a hard WCAG failure" line in the body and a best-practice/experimental label.
• Add two action inputs, file_best_practice_issues and file_experimental_issues (default true), to skip filing those categories

[Copilot]

Pull request overview

This PR adds a classification layer to Axe-based accessibility findings so the scanner can distinguish hard WCAG-related findings from best-practice and experimental checks, reflect that distinction in filed GitHub issues, and allow skipping issue filing for non-WCAG categories via action inputs.

Changes:

• Categorize Axe violations as wcag, best-practice, or experimental, and carry that category through the findings pipeline.
• Surface non-WCAG categorization in filed issues via an issue-body note and a best-practice/experimental label.
• Add file_best_practice_issues / file_experimental_issues inputs and suppress filing (and caching) of new issues in disabled categories.

Show a summary per file

File	Description
action.yml	Adds new top-level action inputs and forwards them into the file sub-action.
.github/actions/find/tests/findForUrl.test.ts	Adds unit tests covering Axe tag-to-category mapping behavior.
.github/actions/find/src/types.d.ts	Introduces FindingCategory and optional category on Finding for the find action.
.github/actions/find/src/findForUrl.ts	Sets category on new Axe findings via categorizeAxeViolation.
.github/actions/file/tests/openIssue.test.ts	Adds tests ensuring non-WCAG category labels are applied (and not applied for WCAG).
.github/actions/file/tests/generateIssueBody.test.ts	Adds tests for including/omitting the non-WCAG note in issue bodies.
.github/actions/file/src/types.d.ts	Introduces FindingCategory and optional category on Finding for the file action.
.github/actions/file/src/openIssue.ts	Adds a category label for non-WCAG findings.
.github/actions/file/src/index.ts	Adds new inputs and gates filing of new issues by category; suppresses disabled-category filings from the output/cache.
.github/actions/file/src/generateIssueBody.ts	Adds a non-WCAG note to issue bodies for best-practice/experimental findings.
.github/actions/file/action.yml	Exposes the new category-gating inputs on the file action itself.

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• Files reviewed: 9/11 changed files
• Comments generated: 2