For #18375: Add experiment for set default browser New Tab card.

[mcarare]

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 #18872 (95c15d0) into master (e8d405b) will decrease coverage by 0.04%.
The diff coverage is 10.81%.

@@             Coverage Diff              @@
##             master   #18872      +/-   ##
============================================
- Coverage     34.42%   34.37%   -0.05%     
  Complexity     1543     1543              
============================================
  Files           526      527       +1     
  Lines         21427    21461      +34     
  Branches       3203     3206       +3     
============================================
+ Hits           7376     7378       +2     
- Misses        13159    13190      +31     
- Partials        892      893       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/mozilla/fenix/experiments/Experiments.kt	0.00% <ø> (ø)	0.00 <0.00> (ø)
...c/main/java/org/mozilla/fenix/home/HomeFragment.kt	3.45% <0.00%> (-0.01%)	6.00 <0.00> (ø)
...fenix/home/sessioncontrol/SessionControlAdapter.kt	0.77% <0.00%> (-0.02%)	0.00 <0.00> (ø)
...ix/home/sessioncontrol/SessionControlController.kt	71.79% <0.00%> (-1.51%)	0.00 <0.00> (ø)
...ix/home/sessioncontrol/SessionControlInteractor.kt	62.96% <0.00%> (-5.04%)	17.00 <0.00> (ø)
...la/fenix/home/sessioncontrol/SessionControlView.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...boarding/ExperimentDefaultBrowserCardViewHolder.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...n/java/org/mozilla/fenix/home/HomeFragmentStore.kt	81.13% <25.00%> (-6.87%)	1.00 <0.00> (ø)
.../src/main/java/org/mozilla/fenix/utils/Settings.kt	72.67% <30.00%> (-0.85%)	36.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e8d405b...95c15d0. Read the comment docs.

[Amejia481]

It looks great, awesome work!

No sure if it's related but the org.mozilla.fenix.ui.HistoryTest.deleteAllHistoryTest UI test is failing.

https://console.firebase.google.com/u/1/project/moz-fenix/testlab/histories/bh.66b7091e15d53d45/matrices/5171125956912378492/executions/bs.6deed8cbf9b84996/test-cases

[Amejia481]

Awesome work 👍🏽