android_interop CI is crashing

It has been flaky for a while because of firebase infrastructure issues. That's "okay." But last week runs started failing because of crashes. But I don't see the crash in the device logs. It is random; it is impacting API 26 the most, but doesn't always fail.

Random example:
```
More details are available at [https://console.firebase.google.com/project/grpc-testing/testlab/histories/bh.6e2cfdde264f9eb3/matrices/6757898078985350132].
WARNING: Need help for test execution [Nexus6P-23-en-portrait]? Please join the #test-lab Slack channel at https://firebase.community/ and include execution ID [6757898078985350132] with your question.
+--------------+------------------------+-------------------------------+
| OUTCOME | TEST_AXIS_VALUE | TEST_DETAILS |
+--------------+------------------------+-------------------------------+
| Failed | Nexus6-22-en-portrait | 1 test cases failed |
| Failed | Nexus6P-26-en-portrait | 1 test cases failed, 1 passed |
| Passed | Nexus6-21-en-portrait | 2 test cases passed |
| Passed | Nexus6P-24-en-portrait | 2 test cases passed |
| Passed | Nexus6P-25-en-portrait | 2 test cases passed |
| Passed | Nexus6P-27-en-portrait | 2 test cases passed |
| Inconclusive | Nexus6P-23-en-portrait | Infrastructure failure |
+--------------+------------------------+-------------------------------+
```