Improve Test Coverage for Speculation Rules Plugin

[sarthak-19]

Summary

This is part of #1789:

• Ignore Coverage for Non-Critical Code Blocks
• Add Missing @covers Annotations
• Add Missing Tests

Before : 50.00% ⚠️	After: 92.00% ✅

cc : @westonruter

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.65%. Comparing base (68c6deb) to head (ddc02d0).

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1845      +/-   ##
==========================================
+ Coverage   65.97%   67.65%   +1.68%     
==========================================
  Files          88       87       -1     
  Lines        6895     6864      -31     
==========================================
+ Hits         4549     4644      +95     
+ Misses       2346     2220     -126     

Flag	Coverage Δ
multisite	67.65% <ø> (+1.68%)	⬆️
single	40.10% <ø> (+1.93%)	⬆️

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[github-actions]

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Co-authored-by: sarthak-19 <[email protected]>
Co-authored-by: westonruter <[email protected]>

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