[FSTORE-1087] Add retries for FlightUnavailableError

[steffengr]

I cannot figure out why get_flight_info keeps failing in some scenarios. It appears like the request does in fact not reach our code. It's either an issue in the network stack, GRPC or ArrowFlight. The best I can do is adding retires which works around the issue.

JIRA Issue: https://hopsworks.atlassian.net/browse/FSTORE-1087

Priority for Review: -

Related PRs: -

How Has This Been Tested?

• Unit Tests
• Integration Tests
• Manual Tests on VM

Checklist For The Assigned Reviewer:

- [ ] Checked if merge conflicts with master exist
- [ ] Checked if stylechecks for Java and Python pass
- [ ] Checked if all docstrings were added and/or updated appropriately
- [ ] Ran spellcheck on docstring
- [ ] Checked if guides & concepts need to be updated
- [ ] Checked if naming conventions for parameters and variables were followed
- [ ] Checked if private methods are properly declared and used
- [ ] Checked if hard-to-understand areas of code are commented
- [ ] Checked if tests are effective
- [ ] Built and deployed changes on dev VM and tested manually
- [x] (Checked if all type annotations were added and/or updated appropriately)

[kennethmhc]

LGTM!