v2.6.43

NEW FEATURES

• add S3_REQUEST_CONTENT_MD5 option for S3-compatible storage backends that require Content-MD5 header on uploads (e.g. Huawei S3), fix 1324, fix 1329

IMPROVEMENTS

• add ClickHouse 26.1, 26.2 to test matrix
• refactor integration tests: split monolithic test file and reorganize configs for better maintainability

BUG FIXES

• fix GCS upload performance regression by letting SDK manage transport instead of custom HTTP client
• fix restore --partitions option error related to Embedded backup
• fix 1328, restore --data --partitions now correctly uses DROP PARTITION ID '<id>' for partition IDs and DROP PARTITION (<tuple>) for tuple-format partitions instead of always using DROP PARTITION, also fix the same issue for Embedded backup/restore