Update github actions for E2E test

[andreia-ferreira]

Towards #3365

This PR updates the existing GitHub action files for running the Android tests.
The workflow defined in test-e2e.yml will run on every push to master, but it can also be triggered manually if needed. This workflow triggers the start-emulator action of ground-platform in order to start the Firebase emulator and then the submit-test on ground-android in order to start the Android emulator and run the tests in the e2eTest module.

While testing this workflow some changes had to be implemented in order to make the tests less flaky:

• Replacing the logic to open the phone camera with Espresso intents. A new image was added to the assets in order to mock the flow
• Remove the step to complete a 'draw area job'. The current implementation to drag the map and add points seems to be flaky so this was left out for now and can be improved and re-introduced later. At the moment all task types are being tested except for this one.

You can see how the workflow run would look like here: https://github.com/andreia-ferreira/ground-android/actions/runs/21182506715

PTAL @shobhitagarwal1612 @gino-m

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.02%. Comparing base (cfc4501) to head (563ec59).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3429      +/-   ##
============================================
- Coverage     70.07%   70.02%   -0.06%     
+ Complexity     1613     1604       -9     
============================================
  Files           322      322              
  Lines          8634     8646      +12     
  Branches        951      949       -2     
============================================
+ Hits           6050     6054       +4     
- Misses         2007     2017      +10     
+ Partials        577      575       -2     

see 7 files with indirect coverage changes

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