[FR] - Replace --quorum with --threshold in conway governance action update-committee

[mkoura]

Internal/External
Internal if an IOHK staff member.

Area
Other Any other topic (Delegation, Ranking, ...).

Describe the feature you'd like
The "quorum" was replaced with "threshold". Argument names should reflect that change, and the --quorum argument should be renamed to --threshold.

Additional context / screenshots
cardano-cli 8.22.0.0