KIP-701 — Add--override option to bin/connect-distributed.sh

Discussion ConnectAdmin

Adds `--override` flag support to `kafka-server-start.sh` for Connect workers, allowing per-property overrides from the command line without modifying the worker properties file. The `kafka-server-start.sh` script already supported `--override` for brokers, but the equivalent Connect startup script did not, requiring file edits for one-off configuration changes.

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