feat: Centralize web vitals timings

[metal-messiah]

Centralize web vitals timings to be accessible from any part of the agent.

Overview

This PR utilizes a singleton export of the vitals timings with a pub/sub methodology to share identical data across the agent. This will create better consistency and replace areas of the agent leaning on differing methodologies.

Related Issue(s)

NR-101330

Testing

Existing timing tests should continue to pass.
New jest tests have been added for each vital file
New jest test has been made to replace some of the web-vitals browser tests that became broken by changing this behavior

[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	28.48 kB / 9.9 kB (gzip)	28.25 kB / 9.8 kB (gzip)	-0.8% / -1.02% (gzip)
lite	async-chunk	43.56 kB / 14.43 kB (gzip)	45.4 kB / 15.03 kB (gzip)	4.24% / 4.15% (gzip)
pro	loader	45.67 kB / 15.35 kB (gzip)	45.35 kB / 15.2 kB (gzip)	-0.7% / -0.93% (gzip)
pro	async-chunk	62.72 kB / 20.21 kB (gzip)	64.45 kB / 20.82 kB (gzip)	2.76% / 3% (gzip)
spa	loader	52.08 kB / 17.3 kB (gzip)	51.76 kB / 17.16 kB (gzip)	-0.62% / -0.81% (gzip)
spa	async-chunk	76.96 kB / 24.5 kB (gzip)	78.67 kB / 25.04 kB (gzip)	2.22% / 2.18% (gzip)
lite-polyfills	loader	98.94 kB / 31.62 kB (gzip)	98.71 kB / 31.43 kB (gzip)	-0.24% / -0.61% (gzip)
lite-polyfills	async-chunk	54.61 kB / 16.41 kB (gzip)	57.86 kB / 17.24 kB (gzip)	5.95% / 5.09% (gzip)
pro-polyfills	loader	118.53 kB / 37.51 kB (gzip)	118.3 kB / 37.37 kB (gzip)	-0.2% / -0.37% (gzip)
pro-polyfills	async-chunk	95.57 kB / 25.77 kB (gzip)	98.82 kB / 26.62 kB (gzip)	3.4% / 3.29% (gzip)
spa-polyfills	loader	126.51 kB / 39.63 kB (gzip)	126.27 kB / 39.5 kB (gzip)	-0.18% / -0.31% (gzip)
spa-polyfills	async-chunk	110.52 kB / 30.36 kB (gzip)	113.7 kB / 31.03 kB (gzip)	2.88% / 2.22% (gzip)
worker	loader	40.57 kB / 13.77 kB (gzip)	40.36 kB / 13.66 kB (gzip)	-0.51% / -0.8% (gzip)
worker	async-chunk	42.38 kB / 14.5 kB (gzip)	45.36 kB / 15.37 kB (gzip)	7.04% / 6.02% (gzip)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@015e0f1). Click here to learn what that means.
The diff coverage is 97.41%.

❗ Current head d75bbfa differs from pull request most recent head 5d0b4c2. Consider uploading reports for the commit 5d0b4c2 to get more accurate results

@@           Coverage Diff           @@
##             main     #635   +/-   ##
=======================================
  Coverage        ?   86.76%           
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  Files           ?      137           
  Lines           ?     5245           
  Branches        ?      808           
=======================================
  Hits            ?     4551           
  Misses          ?      634           
  Partials        ?       60           

Flag	Coverage Δ
unit-tests	79.20% <98.14%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/features/page_view_event/constants.js	100.00% <ø> (ø)
src/features/page_view_event/instrument/index.js	100.00% <ø> (ø)
src/features/page_view_timing/instrument/index.js	100.00% <ø> (ø)
src/features/spa/aggregate/index.js	78.44% <ø> (ø)
src/common/vitals/interaction-to-next-paint.js	71.42% <83.33%> (ø)
src/common/vitals/time-to-first-byte.js	80.00% <85.71%> (ø)
src/common/vitals/long-task.js	96.00% <96.00%> (ø)
src/common/constants/runtime.js	97.36% <100.00%> (ø)
src/common/vitals/constants.js	100.00% <100.00%> (ø)
src/common/vitals/cumulative-layout-shift.js	100.00% <100.00%> (ø)
... and 7 more

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[patrickhousley]

I think this is a lot cleaner and better structured from having an object that gets imported, wrote to, and read from willy nilly in the code base. I do wonder if we should not go ahead and move the other timings that are just in the page view timing aggregator: endCurrentSession and recordPageUnload.

[github-actions]

Last ran on August 28, 2023 20:27:04 CDT
Checking merge of (7b056dd) into main (d233e14)

[patrickhousley]

Looks good. Need jest tests for the new src/common/vitals files.

[metal-messiah]

JIL -> https://github.com/newrelic/newrelic-browser-agent/actions/runs/5863677585