CANTINA-948 (ElasticPress): Add missing properties for Indexable and Block class

[rebeccahum]

Description

Fixes the PHP 8.2 errors:

Creation of dynamic property ElasticPress\Indexable\Post\Post::$labels
Creation of dynamic property ElasticPress\Feature\Facets\Block::$renderer

Changelog Description

Plugin Updated: Enterprise Search

Add missing properties for Indexable and Block class

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally (or has an appropriate fallback).
• This change works and has been tested on a Go sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

[codecov]

Codecov Report

Merging #4905 (86f6e63) into develop (463749c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #4905   +/-   ##
==========================================
  Coverage      29.22%   29.22%           
  Complexity      4723     4723           
==========================================
  Files            277      277           
  Lines          20816    20816           
==========================================
  Hits            6083     6083           
  Misses         14733    14733