SDS: For search, track EP_IS_NETWORK constant

[rebeccahum]

Description

For multisites, track in SDS whether EP_IS_NETWORK constant is set.

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 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 30.55%. Comparing base (3b7ecd5) to head (6c7f342).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
config/class-site-details-index.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #6050      +/-   ##
=============================================
+ Coverage      30.53%   30.55%   +0.01%     
- Complexity      4811     4812       +1     
=============================================
  Files            289      289              
  Lines          21199    21189      -10     
=============================================
+ Hits            6474     6475       +1     
+ Misses         14725    14714      -11     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud