FNX-14372 ⁃ bugfix/Remove all deprecated strings

[BranescuMihai]

As requested here: mozilla-l10n/android-l10n#249 (comment)

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.

After merge

• Milestone: Make sure issues finished by this pull request are added to the milestone of the version currently in development.

To download an APK when reviewing a PR:

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2. click Details next to "Taskcluster (pull_request)" after it appears and then finishes with a green checkmark,
3. click on the "Fenix - assemble" task, then click "Run Artifacts".
4. the APK links should be on the left side of the screen, named for each CPU architecture

[codecov-commenter]

Codecov Report

Merging #13192 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #13192      +/-   ##
============================================
- Coverage     28.23%   28.22%   -0.02%     
  Complexity     1029     1029              
============================================
  Files           418      418              
  Lines         16808    16808              
  Branches       2182     2182              
============================================
- Hits           4746     4744       -2     
- Misses        11717    11719       +2     
  Partials        345      345              

Impacted Files	Coverage Δ	Complexity Δ
...mponents/searchengine/FenixSearchEngineProvider.kt	62.16% <0.00%> (-1.81%)	13.00% <0.00%> (ø%)

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[eliserichards]

Fixes #13226