Generate preview links from build report

[gewarren]

Fixes #701.

[Copilot]

Pull request overview

Updates the preview-link-generator GitHub Action to stop manually constructing preview URLs from the PR file list and instead wait for the OPS OpenPublishing.Build status check and extract preview links directly from the OPS build report, addressing issue #701 (supporting snippets/includes/XML, etc., via whatever the report contains).

Changes:

• Replace GraphQL file enumeration + manual link construction with polling for OpenPublishing.Build and HTML parsing of the build report.
• Simplify the GraphQL PR type shape and remove now-unused file/change-related types and heading-extraction logic.
• Update Jest tests to validate HTML link extraction and table generation based on extracted links.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
actions/preview-link-generator/src/types/PullRequestState.ts	Removes dedicated PR state enum type.
actions/preview-link-generator/src/types/PullRequestDetails.ts	Inlines PR fields into the details type.
actions/preview-link-generator/src/types/Pull.ts	Removes file-enumeration PR type (no longer used).
actions/preview-link-generator/src/types/PageInfo.ts	Removes pagination type (no longer used).
actions/preview-link-generator/src/types/NodeOf.ts	Removes GraphQL edge/node wrapper type (no longer used).
actions/preview-link-generator/src/types/FileChange.ts	Removes file-change type (no longer used).
actions/preview-link-generator/src/types/ChangeType.ts	Removes change-type union (no longer used).
actions/preview-link-generator/src/pull-updater.ts	Core logic change: poll OPS check, download report HTML, extract preview links, build table, update PR body.
actions/preview-link-generator/src/file-heading-extractor.ts	Removes heading extraction logic (no longer needed for table titles).
actions/preview-link-generator/README.md	Updates description to match new OPS-report-based behavior.
actions/preview-link-generator/dist/index.js	Rebuild of bundled action output to reflect source changes.
actions/preview-link-generator/action.yml	Updates action description to match new behavior.
actions/preview-link-generator/tests/sample.md	Removes fixture no longer needed after heading-extractor removal.
actions/preview-link-generator/tests/pull-updater.test.ts	Replaces manual-preview-link tests with build-report parsing + table generation tests.
actions/preview-link-generator/tests/no-heading.md	Removes fixture no longer needed after heading-extractor removal.
actions/preview-link-generator/tests/file-heading-extractor.test.ts	Removes tests for deleted heading-extractor module.
actions/preview-link-generator/tests/3/three.md	Removes fixture no longer needed after heading-extractor removal.

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