chore(APP-2680): Enhance Automated E2E Testing

[Barukimang]

Description

These are updates on automated end-to-end testing, as part of the enhancement of E2E testing. Also created and included a Doc on E2E testing.

Task: APP-2680

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have selected the correct base branch.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [ ] Any dependent changes have been merged and published in downstream modules.
• [x] I have tested my code on the test network.