fix(#3166364): replace dead path hooks with entity hooks

Stuart Clarkrequested to merge
issue/decoupled_router-3166364:fix/3166364-dead-path-hooks into 2.x

Fixes the dead hook_path_update()/hook_path_delete() implementations, plus a getAlias()/getPath() bug that left cache invalidation broken on alias update and delete.

  • Replace the dead hooks with hook_path_alias_update()/hook_path_alias_delete(), based on rollins' patch in #10.
  • Use getPath() instead of getAlias() across all three hooks so cache tags resolve correctly.
  • Also invalidate the original source path when an alias is repointed to a different one, so the entity that lost the alias doesn't keep serving a stale cached response.
  • Kernel test coverage throughout.

Credit to guillerecalde for the original report and patch, and rollins for the patch this builds on.

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