Performance Profiler: add email subscription tracks event

[gcsecsey]

Related to https://github.com/Automattic/dotcom-forge/issues/8811

Proposed Changes

• add email subscription tracks event
• add email unsubscription tracks event

Why are these changes being made?

p1726234242762659-slack-C02JPCHEKDY

Testing Instructions

• Open Chrome devtools and in the Console tab, paste this command to enable analytics logging:

localStorage.setItem( 'debug', 'calypso:analytics*' );

• On the Console tab, set the verbose logging level, and add the calypso_performance_profiler filter:
  
• Start a new test by adding the site URL as a parameter, eg.:

/speed-test-tool?url=google.com

or go to a report page, eg.:

/speed-test-tool?url=https%3A%2F%2Fwordpress.com%2F&hash=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NzA1N30.7KXaBL1qcm0y0GqvM8ymJ0pbST9ls6P09_hri8EaKSI

• Subscribe to the weekly reports for the test
• On the /weekly-report page, check in the logs that the tracks event is fired correctly once the API response is loaded

• Copy the URL params to the /speed-test-tool/weekly-report/unsubscribe page
• check in the logs that the tracks event is fired correctly once the API response is loaded

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-119371

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-119371&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-119371&env=a8c-for-agencies

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~27 bytes added 📈 [gzipped])

name                  parsed_size           gzip_size
performance-profiler       +246 B  (+0.1%)      +27 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/performance-profiler-report-tracks on your sandbox.