fix: Roll back to previous FirstInteraction implementation

[metal-messiah]

Setting agent back to previous FirstInteraction implementation after some reports of slow downs around the performance observer on the first input of a page.

Overview

This is being rolled-back until we can evaluate and implement next steps.

Related Issue(s)

This undos the changes in #1319

Testing

Tests have been reverted.

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	29.76 kB / 10.79 kB (gzip)	29.76 kB / 10.79 kB (gzip)	0% / 0.01% (gzip)
lite	async-chunk	51.25 kB / 16.71 kB (gzip)	52.6 kB / 17.08 kB (gzip)	2.63% / 2.2% (gzip)
pro	loader	51.45 kB / 17.77 kB (gzip)	51.45 kB / 17.78 kB (gzip)	0% / 0.01% (gzip)
pro	async-chunk	98.68 kB / 30.15 kB (gzip)	100.16 kB / 30.56 kB (gzip)	1.5% / 1.33% (gzip)
spa	loader	59.07 kB / 20.09 kB (gzip)	59.07 kB / 20.08 kB (gzip)	0% / -0.01% (gzip)
spa	async-chunk	113.39 kB / 34.48 kB (gzip)	114.87 kB / 34.88 kB (gzip)	1.31% / 1.16% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.65%. Comparing base (cb866e5) to head (51fc6e3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1359      +/-   ##
==========================================
- Coverage   88.70%   88.65%   -0.06%     
==========================================
  Files         170      170              
  Lines        7331     7331              
  Branches     1486     1487       +1     
==========================================
- Hits         6503     6499       -4     
- Misses        717      720       +3     
- Partials      111      112       +1     

Flag	Coverage Δ
unit-tests	79.94% <100.00%> (-0.02%)	⬇️

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[github-actions]

Last ran on January 31, 2025 12:28:12 CST
Checking merge of (076fb20) into main (cb866e5)

[ellisong]

LGTM