initial refactor to remove mediastore client in favor of BucketStore (untested)

[joefutrelle]

This pull request refactors how storage configuration is handled across the codebase by centralizing all S3 and store-related environment variable management into the get_store() utility function. This removes the need to pass storage credentials and configuration throughout the code, simplifying service and command implementations and improving maintainability. The code now supports S3-based storage via amplify-storage-utils BucketStore class, and eliminates the previous dependency on MediaStore.

Storage Refactoring and Centralization:

• All usages of get_store() across management commands, services, and views have been refactored to no longer require passing URL, TOKEN, or MEDIASTORE_PREFIX parameters. These are now read from environment variables directly within get_store(). [1] [2] [3] [4] [5] [6] [7] [8]

• All get_store() calls in commands, services, and views have been updated to use the new signature, further simplifying the code and reducing duplication of environment variable handling. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]

S3 Storage Integration:

• The get_store() utility now supports S3 storage using boto3 and the BucketStore class, reading all required S3 configuration from environment variables. Use of the MediaStore has been removed. [1] [2]

Code Cleanup:

• Unused imports and redundant environment variable assignments have been removed from several files, making the code cleaner and easier to maintain. [1] [2] [3]

These changes modernize the storage backend configuration, reduce boilerplate, and make it easier to switch storage backends in the future.

[joannekoch]

LGTM