[Fix] Initiate a new OAuth external browser login flow in case of refresh token exception

[eric-wang-1990]

What changes are proposed in this pull request?

This PR change the OAuth token cache that when the cached oauth token cannot be refreshed, we still wanna go trigger a new OAuth login flow instead of just throwing an exception.
This help customers who use OAuth U2M, when their cached access token expire they have a way to continue rather than stuck with exception.

How is this tested?

Manual test from dbt-databricks.

[yunbodeng-db]

Miles is OOO.
Please add renaudhartert-db to the reviewer.

[benc-db]

Anything I can do to get this prioritized? We've been stuck on 0.17.0 for more than a year, and this is the last piece needed for us to finish our migration to fully relying on SDK for dbt-databricks auth and being able to use latest versions of SDK.

[renaudhartert-db]

Thanks for the PR @eric-wang-1990! The overall logic looks good to me. Though, I would ideally like to see some form of regression test for this.

[github-actions]

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• PR number: 823
• Commit SHA: 61f0ddaa186d303f1489433696fc657f6ee41822

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[renaudhartert-db]

@eric-wang-1990, I see you've re-assigned the PR to me but I cannot find any additional test in the code. Did you forget to commit the tests or is it that you need guidance to write them?