Issue #3202583: Views cache settings not added to headers

Stuart Clarkrequested to merge
issue/jsonapi_views-3202583:feature/3202583-cache-settings-headers into 8.x-1.x

Fixes #3202583. Views cache settings (tags, contexts, max-age) are now correctly propagated to the JSON:API response.

  • Derives cacheability from the view's own render array instead of the broken $view->result based collection
  • Contextual filters keyed to the current user no longer leak across users
  • 403 responses now carry proper cache tags and contexts too

Builds on yahyaalhamad's patch (comment #11). Tests green on D10 and D11.

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