Removing opencensus-ext-stackdriver and opencensus-ext-ocagent

These library bring in grpcio, which maybe includes a copy of boringssl. The boringssl license seems to have an advertising clause,
which I'd like to avoid.
1 job for !46 with remove-opencensus-deps in 2 minutes and 37 seconds
latest detached
Status Job ID Name Coverage
  Review
failed #264866
osdu-small
trigger-trusted-tests

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failed
trigger-trusted-tests Review
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ERROR: Job failed: exit code 1