Remove segmentsToBeDropped from SegmentTransactionInsertAction

[kfaraz]

Description

There is no usage of the SegmentTransactionInsertAction which passes a non-null non-empty value of segmentsToBeDropped.
This is not really needed either as overshadowed segments are marked as unused by the Coordinator and need not be done in the same transaction as committing segments.

This will also help simplify the changes being made in #14407

Changes

• Remove segmentsToBeDropped from the task action and all methods that have just been passing null
• Remove related tests which are not needed anymore

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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.

[AmatyaAvadhanula]

LGTM, @kfaraz! +1 after all the checks pass

[kfaraz]

Thanks for the prompt review, @AmatyaAvadhanula !