For #18711 - Refactor credit card telemetry under the Metrics ping

[gabrielluong]

Fixes #18711

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

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[codecov-commenter]

Codecov Report

Merging #19733 (6455281) into master (5c28e7d) will increase coverage by 0.04%.
The diff coverage is 77.27%.

@@             Coverage Diff              @@
##             master   #19733      +/-   ##
============================================
+ Coverage     35.35%   35.40%   +0.04%     
  Complexity     1649     1649              
============================================
  Files           545      545              
  Lines         22091    22097       +6     
  Branches       3280     3280              
============================================
+ Hits           7811     7824      +13     
+ Misses        13378    13370       -8     
- Partials        902      903       +1     

Impacted Files	Coverage Δ
...java/org/mozilla/fenix/components/metrics/Event.kt	41.16% <ø> (-0.21%)	⬇️
...la/fenix/components/metrics/GleanMetricsService.kt	19.88% <ø> (+0.22%)	⬆️
...x/settings/creditcards/CreditCardEditorFragment.kt	0.00% <0.00%> (ø)
...rc/main/java/org/mozilla/fenix/FenixApplication.kt	26.00% <50.00%> (+0.48%)	⬆️
...zilla/fenix/components/metrics/MetricController.kt	36.00% <100.00%> (+1.77%)	⬆️
...editcards/controller/CreditCardEditorController.kt	41.17% <100.00%> (-3.27%)	⬇️
.../src/main/java/org/mozilla/fenix/utils/Settings.kt	73.24% <100.00%> (+0.46%)	⬆️
...rg/mozilla/fenix/settings/account/AccountUiView.kt	36.58% <0.00%> (+2.43%)	⬆️

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[rocketsroger]

Looks good. 🚢