With the recent introduction of retry_strategy to Seastar, the pure virtual class previously defined in ScyllaDB is now redundant. This change allows us to streamline our codebase by directly inheriting from Seastar’s implementation, eliminating duplication in ScyllaDB.
Despite this update is purely a refactoring effort and does not introduce functional changes it should be ported back to 2025.3 and 2025.4 otherwise it will make future backports of bugfixes/improvements related to `s3_client` near to impossible
ref: https://github.com/scylladb/seastar/issues/2803
depends on: https://github.com/scylladb/seastar/pull/2960Closesscylladb/scylladb#25801
* github.com:scylladb/scylladb:
s3_client: remove unnecessary `co_await` in `make_request`
s3 cleanup: remove obsolete retry-related classes
s3_client: remove unused `filler_exception`
s3_client: fix indentation
s3_client: simplify chunked download error handling using `make_request`
s3_client: reformat `make_request` functions for readability
s3_client: eliminate duplication in `make_request` by using overload
s3_client: reformat `make_request` function declarations for readability
s3_client: reorder `make_request` and helper declarations
s3_client: add `make_request` override with custom retry and error handler
s3_client: migrate s3_client to Seastar HTTP client
s3_client: fix crash in `copy_s3_object` due to dangling stream
s3_client: coroutinize `copy_s3_object` response callback
aws_error: handle missing `unexpected_status_error` case
s3_creds: use Seastar HTTP client with retry strategy
retry_strategy: add exponential backoff to `default_aws_retry_strategy`
retry_strategy: introduce Seastar-based retry strategy
retry_strategy: update CMake and configure.py for new strategy
retry_strategy: rename `default_retry_strategy` to `default_aws_retry_strategy`
retry_strategy: fix include
retry_strategy: Copied utils/s3/retry_strategy.hh to utils/s3/default_aws_retry_strategy.hh
retry_strategy: Copied utils/s3/retry_strategy.cc to utils/s3/default_aws_retry_strategy.cc
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