Feedback form: upload attachments

[nbradbury]

Partially addresses #21105

This PR is the first pass at adding attachment uploading to the feedback form. To test:

• Tap Help on the Me page and ensure the "Contact email" is correct
• Return to the Me page and tap "Send feedback"
• Enter a message
• Add a couple of attachments
• Tap submit and verify it all works
• When you get the email about the ticket, go to https://a8c.zendesk.com/agent/tickets/$ticketNumber and verify the attachments were added

A couple of caveats:

• I'm not wild about having to use a "completion handler" to determine when all attachments have been uploaded. I hope to resolve this but the fact that Zendesk relies on callbacks may have tied my hands.
• There is no preview of attachments (that may come later, but wasn't deemed high priority)
• There isn't a way to cancel the attachment uploading. This is more of a priority, but again the fact that Zendesk relies on callbacks may be a problem.

attach.mp4

[dangermattic]

	1 Warning
⚠️	Class ZendeskUploadHelper is missing tests, but unit-tests-exemption label was set to ignore this.

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
2 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

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21115-765f77f
	Commit	765f77f
	Direct Download	wordpress-prototype-build-pr21115-765f77f.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21115-765f77f
	Commit	765f77f
	Direct Download	jetpack-prototype-build-pr21115-765f77f.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 50 lines in your changes missing coverage. Please review.

Project coverage is 40.58%. Comparing base (490dcf2) to head (765f77f).

Files	Patch %	Lines
...roid/ui/main/feedbackform/FeedbackFormViewModel.kt	0.00%	33 Missing ⚠️
...g/wordpress/android/support/ZendeskUploadHelper.kt	0.00%	15 Missing ⚠️
...ava/org/wordpress/android/support/ZendeskHelper.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                          @@
##           feature/feedback-form-attachments   #21115      +/-   ##
=====================================================================
- Coverage                              40.60%   40.58%   -0.03%     
=====================================================================
  Files                                   1533     1534       +1     
  Lines                                  70453    70494      +41     
  Branches                               11645    11653       +8     
=====================================================================
  Hits                                   28607    28607              
- Misses                                 39261    39302      +41     
  Partials                                2585     2585              

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[nbradbury]

Although this could use improvement, I'm merging it as-is into the feature branch and will work on improvements separately.