Addition of retry paths that don't have it yet

[vaibhav-datazip]

Problem

Retry coverage is uneven. Several network-touching calls are bare return err, so a transient failure surfaces as exit 1 without ever being retried.

Source side

Examples:

• connector.Setup : protocol/sync.go:95. Opens the driver connection (connect + PingContext, SSH tunnel when configured). No retry wrapper.
• GetStreamNames : drivers/abstract/abstract.go:81. Live catalog query. No retry wrapper.

Others in the same shape worth checking while in there: PreCDC (drivers/abstract/cdc.go:25) and GetOrSplitChunks (drivers/abstract/backfill.go:22).

Similar retry needs to be checked in destination side for parquet and iceberg destination and handled there as well.

Retry defaults

Minor, but related: postgres, oracle and db2 don't set constants.DefaultRetryCount in their config Validate(), so an unset retry_count gives a single attempt. mysql, mssql, kafka, mongodb and s3 all set it - see drivers/mysql/internal/config.go:122 for the pattern.

Reference

Existing helpers:

• utils/utils.go:481 : RetryOnBackoff (exponential; short-circuits on constants.ErrNonRetryable)
• utils/utils.go:452 : RetryWithSkip (linear, caller-supplied predicate)
• utils/concurrent.go:142 :AddWithRetry

Call sites already doing it right: drivers/abstract/cdc.go:87, drivers/abstract/backfill.go:97, drivers/abstract/incremental.go:63.