Simplify Parse.ly loader

[rinatkhaziev]

Description

We're reducing the number of ways the plugin can be loaded. Eventually there will be only one way (via Integrations) and the rest will be gradually phased out.

Changelog Description

Removed

• Removed ability to load Parse.ly via an option.

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 in Codespaces (or has an appropriate fallback).
• This change works and has been tested on a 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

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 29.68%. Comparing base (5bf6176) to head (206c8ef).

Files with missing lines	Patch %	Lines
wp-parsely.php	75.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5863      +/-   ##
=============================================
+ Coverage      29.64%   29.68%   +0.03%     
  Complexity      4760     4760              
=============================================
  Files            281      281              
  Lines          20534    20500      -34     
=============================================
- Hits            6087     6085       -2     
+ Misses         14447    14415      -32     

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[sonarcloud]

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[rinatkhaziev]

This now reads ... weird. But I didn't want to introduce any extra changes to the logic.