docs: Update Appium documentation

[cortisiko]

Description

The goal of this task is to enhance the clarity of the Appium section, ensuring that everyone understands how tests are executed and triggered. The section needs refinement to provide clearer step-by-step instructions, so the process is easy to follow and all team members are aligned.

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]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.91%. Comparing base (8dcdd3c) to head (7892d8f).
Report is 62 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11124      +/-   ##
==========================================
+ Coverage   52.75%   52.91%   +0.16%     
==========================================
  Files        1534     1545      +11     
  Lines       36777    36901     +124     
  Branches     4335     4352      +17     
==========================================
+ Hits        19403    19528     +125     
+ Misses      16058    16052       -6     
- Partials     1316     1321       +5     

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[chrisleewilcox]

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

[NicolasMassart]

A bit late to comment as it's merged already, but I wanted to say it's nice work!