For #7158: Improves browser to search animation

[sblatz]

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.

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[ekager]

nit - i like the comment but it looks a little weird at the bottom of this fun? Maybe at the top makes sense?

[sblatz]

Updated 😄

[codecov-io]

Codecov Report

Merging #8961 into master will decrease coverage by 0.03%.
The diff coverage is 17.39%.

@@             Coverage Diff              @@
##             master    #8961      +/-   ##
============================================
- Coverage     18.92%   18.89%   -0.04%     
  Complexity      502      502              
============================================
  Files           330      330              
  Lines         13043    13059      +16     
  Branches       1725     1727       +2     
============================================
- Hits           2468     2467       -1     
- Misses        10364    10382      +18     
+ Partials        211      210       -1

Impacted Files	Coverage Δ	Complexity Δ
...nix/components/toolbar/BrowserToolbarController.kt	62.2% <ø> (-2.33%)	0 <0> (ø)
.../java/org/mozilla/fenix/browser/BrowserAnimator.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...in/java/org/mozilla/fenix/search/SearchFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
.../java/org/mozilla/fenix/search/SearchController.kt	72.85% <100%> (+1.21%)	0 <0> (ø)	⬇️

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