[SYNC-3518] Add requirements.txt for automation directory

[ylogx]

Changes

• Adds the missing requirements.txt with the required dependencies for automation directory
• Adds dependency installation instructions in the relevant documentations

Impact

• Closes Create requirements.txt for the automation directory #5281
• Less confusion due to missing dependencies
• Makes it easier to use more python packages for automation in future

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due dilligence applied in selecting them.

Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (399fe73) 36.91% compared to head (f2fc7ab) 36.91%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5855   +/-   ##
=======================================
  Coverage   36.91%   36.91%           
=======================================
  Files         346      346           
  Lines       33430    33430           
=======================================
  Hits        12340    12340           
  Misses      21090    21090           

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[tarikeshaq]

Thank you for your contribution @ylogx!! 🙏