[Doc][C++][Python] Docs built and pushed with S3 and Flight disabled

[asfimport]

The ubuntu-docs image doesn't enable S3 nor Flight when building the C++ and Python docs.

https://arrow.apache.org/docs/python/api/flight.html
https://arrow.apache.org/docs/python/api/filesystems.html

Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #9933

_{Note: This issue was originally created as ARROW-12262. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 9933
#9933