Add non-configurable exclusion list for known incompatible scripts

[mreishus]

Summary
Creates a hardcoded list of scripts known to break concatenation, starting with MonsterInsights which requires type="module". Unlike the configurable exclusion list, this applies to all installations regardless of user settings.

Background
MonsterInsights modifies its script tag to type="module" via script_loader_tag filter, which breaks when concatenated because the concatenated version loses this attribute, and uses ES6 import statements that require it. Found here: 9017084-zd-a8c

Possible Approach 1: Add to default exclusion list

  + Simple, uses existing mechanism
  - Only works for new installations or default settings. Anyone who has tweaked doesn't get the fix.

Possible Approach 2: Detect module scripts by running script_loader_tag filter and checking results.

  + Catches all module scripts using this technique automatically
  - Some runtime overhead checking script tags
  - Not sure how popular this pattern actually is.

Current Approach 3: Known incompatible list

  + Works for all installations regardless of settings
  + Very little runtime overhead
  + Clear separation between user and compatibility exclusions
  - Requires code changes for new conflicts

Steps to Reproduce

• On a site, install and activate both page-optimize and MonsterInsights.
• Visit homepage.
• Check browser console for: Uncaught SyntaxError: import declarations may only appear at top level of module.

To verify fix

• Reproduce the problem
• apply the patch
• visit the homepage
• the SyntaxError seen above should no longer appear.

[mreishus]

This should not be needed after #107 stops concat for script-loader-tag changed scripts.