Tested email analytics initializer

[EvanHahn]

no ref

I recommend reviewing this one commit at a time.

This change should have no user impact.

This change:

• tests the email analytics initializer
• stops using global references and injects the dependencies (DI)

In addition to automated testing, I also manually tested this. I sent a newsletter, opened it in Gmail, and verified that I saw the open appear in the newsletter's analytics.

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[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.41%. Comparing base (e398296) to head (cb47242).

Files with missing lines	Patch %	Lines
...email-analytics/email-analytics-service-wrapper.js	74.41%	10 Missing and 1 partial ⚠️
...core/core/server/services/email-analytics/index.ts	98.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           data-db-types   #29892   +/-   ##
==============================================
  Coverage          75.40%   75.41%           
==============================================
  Files               1609     1609           
  Lines             142278   142368   +90     
  Branches           17610    17609    -1     
==============================================
+ Hits              107284   107363   +79     
- Misses             33920    33930   +10     
- Partials            1074     1075    +1     

Flag	Coverage Δ
e2e-tests	77.45% <90.00%> (+<0.01%)	⬆️

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