feat: Add Flank version info to requests

[adamfilipow92]

Fixes #1925

Test Plan

How do we know the code works?

In user agent Flank, sends version and revision.

This change adds version and revision to user agent by setApplicationName method. Let me know if it's fine. We can also add a new header client_info by using setTestingRequestInitializer and setToolResultsRequestInitializer.

[github-actions]

Timestamp: 2021-07-08 08:56:56
Buildscan url for ubuntu-workflow run 1011004148
https://gradle.com/s/gd4qz3duzpdlm

[bootstraponline]

ah, this isn't the right approach.

application name should stay the same. otherwise google is unable to pull stats on the flank client.

version info should be sent using client info details (as mentioned on the ticket)

[adamfilipow92]

ah, this isn't the right approach.

application name should stay the same. otherwise google is unable to pull stats on the flank client.

version info should be sent using client info details (as mentioned on the ticket)

Thanks for the feedback, here is a current client_info example:

   "name":"Flank",
   "client_info_details":[
      {
         "key":"Flank Version",
         "value":"local_snapshot"
      },
      {
         "key":"Flank Revision",
         "value":"97854618886695c5005f9bc8d4e9a69eb7e922ed"
      }
   ]

I hope now everything is fine.

[bootstraponline]

this looks good to me!

let's have one other member of the team approve as well.

[bootstraponline]

return self._messages.TestMatrix(
        testSpecification=spec,
        environmentMatrix=environment_matrix,
        clientInfo=client_info,
        resultStorage=results,
        flakyTestAttempts=self._args.num_flaky_test_attempts or 0)

https://github.com/Flank/gcloud_cli/blob/55ba35ba9d631096f05f3c0bfa5cf1182134b47e/google-cloud-sdk/lib/googlecloudsdk/api_lib/firebase/test/ios/matrix_creator.py#L177

https://github.com/Flank/gcloud_cli/blob/55ba35ba9d631096f05f3c0bfa5cf1182134b47e/google-cloud-sdk/lib/googlecloudsdk/api_lib/firebase/test/matrix_creator_common.py#L25

I looked at the code in gcloud and we're suppose to set clientInfo on the TestMatrix object, not via a testing request initializer.

[adamfilipow92]

```python
return self._messages.TestMatrix(
        testSpecification=spec,
        environmentMatrix=environment_matrix,
        clientInfo=client_info,
        resultStorage=results,
        flakyTestAttempts=self._args.num_flaky_test_attempts or 0)

https://github.com/Flank/gcloud_cli/blob/55ba35ba9d631096f05f3c0bfa5cf1182134b47e/google-cloud-sdk/lib/googlecloudsdk/api_lib/firebase/test/ios/matrix_creator.py#L177
https://github.com/Flank/gcloud_cli/blob/55ba35ba9d631096f05f3c0bfa5cf1182134b47e/google-cloud-sdk/lib/googlecloudsdk/api_lib/firebase/test/matrix_creator_common.py#L25
I looked at the code in gcloud and we're suppose to set clientInfo on the TestMatrix object, not via a testing request initializer.

Right, thanks! I changed my implementation to using client info on the TestMatrix.