Fixes #5456 Reduce az_search_api noncanonical duplicates

[tadean]

Description

This PR adds an a new az_search_api processor called az_canonical that strikes content from the index if its canonical metatag does not match the content's url.

Release notes

az_search_api will now skip indexing of content that is not canonical to the site, as defined by the opengraph url metatag.

Related issues

#5456

How to test

• See testing instructions in Fixes #5095 New experimental module providing Solr/Search API configuration #5104 for instructions on how to set up credential secrets
• Create content, or use demo content
• Verify that some created content uses metatag "Opengraph Page Url" that points elsewhere
  • Some demo content meets this condition
• Visit /admin/config/search/search-api/index/az_search_api_index
• Click Queue all items for reindexing
• Click Index now
• Visit watchdog log, verify there are log entries from az_search_api mentioning that certain pages were not indexed

Types of changes

Arizona Quickstart (install profile, custom modules, custom theme)

• Patch release changes
  • Bug fix
  • Accessibility, performance, or security improvement
  • Critical institutional link or brand change
  • Adding experimental module
  • Update experimental module
• Minor release changes
  • New feature
  • Breaking or visual change to existing behavior
  • Upgrade experimental module to stable
  • Enable existing module by default or database update
  • Non-critical brand change
  • New internal API or API improvement with backwards compatibility
  • Risky or disruptive cleanup to comply with coding standards
  • High-risk or disruptive change (requires upgrade path, risks regression, etc.)
• Other or unknown
  • Other or unknown

Drupal core

• Patch release changes
  • Security update
  • Patch level release (non-security bug-fix release)
  • Patch removal that's no longer necessary
• Minor release changes
  • Major or minor level update
• Other or unknown
  • Other or unknown

Drupal contrib projects

• Patch release changes
  • Security update
  • Patch or minor level update
  • Add new module
  • Patch removal that's no longer necessary
• Minor release changes
  • Major level update
• Other or unknown
  • Other or unknown

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My change requires release notes.

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