test: Appium separate and optimize app launch time measurements

[cortisiko]

Description

This PR refactors the app launch times measurement to capture the time each screen appears, improving granularity. Previously, both cold start tests were in a single feature file, making it difficult to isolate specific test sessions in BrowserStack. Now, the two cold start scenarios are split into separate feature files, allowing for easier identification and tracking of individual test sessions in browserstack.

NOTE: The baseline measures were generated based on ten consecutive runs.

Related issues

Fixes:

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[Cal-L]

Left some comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.76%. Comparing base (7475ab4) to head (33e0e8c).
Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11213      +/-   ##
==========================================
+ Coverage   55.24%   55.76%   +0.51%     
==========================================
  Files        1558     1580      +22     
  Lines       37153    37627     +474     
  Branches     4406     4501      +95     
==========================================
+ Hits        20527    20981     +454     
- Misses      16155    16156       +1     
- Partials      471      490      +19     

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[Cal-L]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud