[chassis] [MA] configlet CLI not supporting multi-asic

[wenyiz2021]

Description

configlet right now is not supporting multi-asic, it does not get config db from namespace.
result in configlet fail to delete configuration on either config_db.json/config_db0.json etc for multi-asic platform.

we should do sth like:
config_db = multi_asic.connect_config_db_for_ns(namespace)

right now:
https://github.com/sonic-net/sonic-utilities/blob/c301f3bb5c62d14a764706164488ccf679a2ac8d/scripts/configlet#L90C1-L90C4

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[rlhui]

Without this, what's the current impact?