🗑️ [RUMF-1433] Remove Preflight request Performance Entry check

[liywjl]

Motivation

If we match 2 performance entries on a request, we try and check if one of them is a preflight option request.

This behaviour is no longer present on modern browsers.

Changes

• remove check
• delete adjacent test

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1813 (df9c12f) into main (0ab07cb) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1813      +/-   ##
==========================================
+ Coverage   93.23%   93.25%   +0.01%     
==========================================
  Files         131      131              
  Lines        5071     5067       -4     
  Branches     1136     1135       -1     
==========================================
- Hits         4728     4725       -3     
+ Misses        343      342       -1     

Impacted Files	Coverage Δ
...rumEventsCollection/resource/matchRequestTiming.ts	94.44% <ø> (-1.02%)	⬇️
packages/core/src/tools/timeUtils.ts	100.00% <0.00%> (+2.56%)	⬆️

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