Move ITS3AssumeRoleIndexTest and ITS3OverrideCredentialsIndexTest

[kfaraz]

Changes

• Add method in MinIOStorageResource to create temporary credentials using AssumeRoleRequest
• Add test method to ITS3ToS3ParallelIndexTest to test ingestion with temporary override credentials
• It is currently not possible to test assumeRoleArn/assumeRoleExternalId using Min IO since they are not supported
• Remove old integration tests

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[kfaraz]

Thanks for the review, @clintropolis !