CDC: history_start_seqno got reset to zero after updating new 'history_retention_seconds' value

Build: 7.2.0-5154

Scenario:

• Single node cluster
• Magma bucket with hist. retention enabled
• Perform initial load to create doc_history using cont. updates
• Update history_retention_seconds=10

  Updated bucket "bucket-0" (of type couchbase) properties:

  [{ram_quota,268435456},{storage_mode,magma},{history_retention_seconds,10}] ... (11:17:54 AM)

• Perform cont. update on few set of keys again

Observation:

During the cont. updates, hist_start_seqno values got reset to '0'

For example, consider this vb_zero:

Before update:

[2023-02-12 11:18:01,691] 0: {'active': {'high_seqno': '853', 'history_start_seqno': '1'},

..

..

After update:

[2023-02-12 11:18:04,084] 0: {'active': {'high_seqno': '853', 'history_start_seqno': '0'},