error-reporting: Should correctly publish an error that is of an unknown type failed

[flaky-bot]

This test failed!

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---

commit: 25a65d9
buildURL: Build Status, Sponge
status: failed

Test output

ifError got unwanted exception: invalid_grant: Invalid JWT Signature.
AssertionError [ERR_ASSERTION]: ifError got unwanted exception: invalid_grant: Invalid JWT Signature.
    at /workspace/build/system-test/error-reporting.js:438:32
        -> /workspace/system-test/error-reporting.ts:614:22
    at /workspace/build/src/google-apis/auth-client.js:160:17
        -> /workspace/src/google-apis/auth-client.ts:199:11
    at onAuthenticated (node_modules/@google-cloud/common/build/src/util.js:396:25)
    at prepareRequest (node_modules/@google-cloud/common/build/src/util.js:452:28)
    at Gaxios._request (node_modules/gaxios/build/src/gaxios.js:130:23)
        -> /workspace/node_modules/gaxios/src/gaxios.ts:158:15
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async GoogleToken.requestToken (node_modules/gtoken/build/src/index.js:238:23)
    at async GoogleToken.getTokenAsync (node_modules/gtoken/build/src/index.js:145:20)
    at async JWT.refreshTokenNoCache (node_modules/google-auth-library/build/src/auth/jwtclient.js:172:23)
    at async JWT.getRequestMetadataAsync (node_modules/google-auth-library/build/src/auth/oauth2client.js:284:17)
    at async JWT.getRequestHeaders (node_modules/google-auth-library/build/src/auth/oauth2client.js:247:26)
    at async GoogleAuth.authorizeRequest (node_modules/google-auth-library/build/src/auth/googleauth.js:677:25)
    at async Promise.all (index 1)
    at async prepareRequest (node_modules/@google-cloud/common/build/src/util.js:442:61)

[losalex]

Flaky due to credentials issue