fix: relative timestamps in session trace

[patrickhousley]

In rare cases where PerformanceNavigationTiming API is undefined, session trace timing nodes would be reported using epoch timestamp values instead of relative timestamp values. This would result in a broken session trace experience in New Relic. If the PerformanceNavigationTiming API is unavailable, the epoch timestamps will now be converted to relative timestamps accounting for user clock difference with New Relic servers.

Overview

Added code to convert epoch timestamps from performance.timing to relative timestamps correcting for NR server time.

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-297306

Testing

[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	32.48 kB / 11.31 kB (gzip)	32.48 kB / 11.31 kB (gzip)	0% / 0.02% (gzip)
lite	async-chunk	50.45 kB / 16.25 kB (gzip)	50.52 kB / 16.26 kB (gzip)	0.14% / 0.07% (gzip)
pro	loader	53.51 kB / 18.04 kB (gzip)	53.51 kB / 18.04 kB (gzip)	0% / 0.02% (gzip)
pro	async-chunk	97.58 kB / 29.17 kB (gzip)	98.44 kB / 29.33 kB (gzip)	0.88% / 0.54% (gzip)
spa	loader	61.47 kB / 20.47 kB (gzip)	61.47 kB / 20.48 kB (gzip)	0% / 0.01% (gzip)
spa	async-chunk	112.67 kB / 33.51 kB (gzip)	113.53 kB / 33.65 kB (gzip)	0.77% / 0.44% (gzip)

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.85%. Comparing base (fbc6f9d) to head (167f544).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/features/session_replay/aggregate/index.js	50.00%	2 Missing ⚠️
src/common/timing/time-keeper.js	83.33%	1 Missing ⚠️
src/features/jserrors/aggregate/index.js	80.00%	1 Missing ⚠️
src/features/page_view_event/aggregate/index.js	0.00%	1 Missing ⚠️
.../features/session_trace/aggregate/trace/storage.js	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1142      +/-   ##
==========================================
+ Coverage   88.77%   88.85%   +0.07%     
==========================================
  Files         162      162              
  Lines        7289     7303      +14     
  Branches     1444     1446       +2     
==========================================
+ Hits         6471     6489      +18     
+ Misses        707      705       -2     
+ Partials      111      109       -2     

Flag	Coverage Δ
integration-tests	91.68% <68.42%> (+0.05%)	⬆️
unit-tests	79.20% <64.28%> (-0.01%)	⬇️

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[github-actions]

Last ran on August 16, 2024 00:52:48 CDT
Checking merge of (167f544) into main (fbc6f9d)