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This patch introduces a new `incremental_mode` parameter to the tablet repair REST API, providing more fine-grained control over the incremental repair process. Previously, incremental repair was on and could not be turned off. This change allows users to select from three distinct modes: - `regular`: This is the default mode. It performs a standard incremental repair, processing only unrepaired sstables and skipping those that are already repaired. The repair state (`repaired_at`, `sstables_repaired_at`) is updated. - `full`: This mode forces the repair to process all sstables, including those that have been previously repaired. This is useful when a full data validation is needed without disabling the incremental repair feature. The repair state is updated. - `disabled`: This mode completely disables the incremental repair logic for the current repair operation. It behaves like a classic (pre-incremental) repair, and it does not update any incremental repair state (`repaired_at` in sstables or `sstables_repaired_at` in the system.tablets table). The implementation includes: - Adding the `incremental_mode` parameter to the `/storage_service/repair/tablet` API endpoint. - Updating the internal repair logic to handle the different modes. - Adding a new test case to verify the behavior of each mode. - Updating the API documentation and developer documentation. Fixes #25605 Closes scylladb/scylladb#25693