UITests: New tests for save Login prompt

[isabelrios]

This PR adds tests for the Save Login prompt feature

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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[codecov-io]

Codecov Report

Merging #8381 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8381      +/-   ##
============================================
- Coverage     18.59%   18.57%   -0.03%     
  Complexity      459      459              
============================================
  Files           319      318       -1     
  Lines         12728    12616     -112     
  Branches       1680     1662      -18     
============================================
- Hits           2367     2343      -24     
+ Misses        10161    10074      -87     
+ Partials        200      199       -1

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/java/org/mozilla/fenix/utils/Settings.kt	74.78% <0%> (-4.5%)	28% <0%> (ø)
...rc/main/java/org/mozilla/fenix/FenixApplication.kt	13.67% <0%> (-0.62%)	3% <0%> (ø)
...nix/components/toolbar/BrowserToolbarController.kt	58.52% <0%> (-0.44%)	0% <0%> (ø)
...pp/src/main/java/org/mozilla/fenix/HomeActivity.kt	11.03% <0%> (-0.08%)	10% <0%> (ø)
...pp/src/main/java/org/mozilla/fenix/FeatureFlags.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
...a/fenix/settings/DefaultBrowserSettingsFragment.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
...n/java/org/mozilla/fenix/IntentReceiverActivity.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
...s/deletebrowsingdata/DeleteBrowsingDataFragment.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
.../fenix/settings/account/AccountSettingsFragment.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
.../mozilla/fenix/settings/PrivateBrowsingFragment.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 6 more

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[KMaragh]

Same as above.

[KMaragh]

I think moving all of these methods into the browser robot will make it easier to read what is going on in this test class.

[KMaragh]

I would move this into the openLoginsAndPasswordSubmenu function. This way anytime you expect to open the menu, the function will scroll there for you.