cli: "--output" flag not supported for "tendermint-validator-set" query

[alpe]

Summary of Bug

The CLI returns yaml only.
The --output flag is not supported:

cmd.Flags().StringP(tmcli.OutputFlag, "o", "text", "Output format (text|json)")

Should be added to the query command

Version

v0.45.0 and current master

Steps to Reproduce

simd q tendermint-validator-set -h

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