[Java] Flight client doesn't handle auth correctly in some cases

[asfimport]

The Flight Client does not add auth token to some async requests. The interceptor doesn't get added when creating a new ClientCall

Reporter: Ryan Murray / @rymurr
Assignee: Ryan Murray / @rymurr

PRs and other links:

• GitHub Pull Request #4238

_{Note: This issue was originally created as ARROW-5249. Please see the migration documentation for further details.}