JAVA-6064 : Failing AWS auth functional test

Summary

The java driver has the following functional test
It's annotated as ignored if session token is not present in env variables
The test is checking that mongo connection will fail when fake aws session is given
But because of this commit the session token is now exposed in env variables which makes this test run and fail because the fake token is ignored and connection is not failing

Changes in this PR

This PR skips saving aws session in env variables when no uri is present

Test Plan

For now it was only testes against java build
Here is the patch

Checklist

Checklist for Author

• Does the title of the PR reference a JIRA Ticket?
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Checklist for Reviewer

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• Is all relevant documentation (README or docstring) updated?