[CLI-3095] On kafka topic update --config num.partitions=XXX, poll for updates or print warning

[tmalikconfluent]

Release Notes

Bug Fixes

• CLI shows the correct partition count on confluent kafka topic update my-topic --config num.partitions=X command

Checklist

• [x] Leave this box unchecked if features are not yet available in production

What

On kafka topic update --config num.partitions=XXX, poll for updates or print warning

References

https://confluentinc.atlassian.net/browse/CLI-3095

Test & Review

Updated the integration tests.