Uplift for 15711 - Custom search providers deleted after upgrade to 81.1.12 Build 2015767043

[st3fan]

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.

To download an APK when reviewing a PR:

1. click on Show All Checks,
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-io]

Codecov Report

Merging #15938 into releases/v82.0.0 will decrease coverage by 0.00%.
The diff coverage is 80.00%.

@@                  Coverage Diff                   @@
##             releases/v82.0.0   #15938      +/-   ##
======================================================
- Coverage               29.21%   29.21%   -0.01%     
  Complexity               1159     1159              
======================================================
  Files                     456      456              
  Lines                   18654    18654              
  Branches                 2414     2414              
======================================================
- Hits                     5450     5449       -1     
- Misses                  12820    12822       +2     
+ Partials                  384      383       -1     

Impacted Files	Coverage Δ	Complexity Δ
...mponents/searchengine/FenixSearchEngineProvider.kt	58.92% <80.00%> (-0.90%)	15.00 <1.00> (ø)

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[liuche]

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