Reorganize dropdown.js

[luixxiul]

Closes #11063

• Replace specific components with ones styled with data attirbutions

Auditors:

Test Plan:

1. Open about:styles
2. Click dropdowns
3. Make sure they are properly styled
4. Open about:autofill
5. Click Add Address
6. Make sure the country dropdown has 100% width

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Test Plan:

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[codecov-io]

Codecov Report

Merging #11064 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #11064      +/-   ##
==========================================
+ Coverage   53.32%   53.33%   +<.01%     
==========================================
  Files         251      251              
  Lines       21807    21798       -9     
  Branches     3401     3401              
==========================================
- Hits        11629    11626       -3     
+ Misses      10178    10172       -6

Flag	Coverage Δ
#unittest	53.33% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
app/renderer/components/common/commonForm.js	31.48% <ø> (+1.65%)	⬆️
app/renderer/components/common/dropdown.js	100% <ø> (+9.37%)	⬆️
...r/components/preferences/payment/enabledContent.js	94.06% <100%> (ø)	⬆️

[cezaraugusto]

should this land before #10978 or the opposite?

[luixxiul]

I cannot remember well how much this PR is dependent on #10978 but I don't think they addresses different issues (#10978 does not modify dropdown.js) so let's merge #10978 first in case. If there would be conflicts, I'll fix those.