cscli: consistent status and usage message for unknown subcommands

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

❌ Patch coverage is 34.37500% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.16%. Comparing base (a3dbe7f) to head (35d0425).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/crowdsec-cli/clialert/alerts.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/cliallowlists/allowlists.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clibouncer/bouncers.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clicapi/capi.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/cliconfig/config.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clidecision/decisions.go	40.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clihubtest/hubtest.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/cliitem/item.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clilapi/lapi.go	25.00%	2 Missing and 1 partial ⚠️
cmd/crowdsec-cli/climachine/machines.go	25.00%	2 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4320      +/-   ##
==========================================
- Coverage   63.28%   63.16%   -0.13%     
==========================================
  Files         472      472              
  Lines       33382    33434      +52     
==========================================
- Hits        21126    21118       -8     
- Misses      10142    10186      +44     
- Partials     2114     2130      +16     

Flag	Coverage Δ
bats	46.65% <34.37%> (-0.05%)	⬇️
unit-linux	36.05% <0.00%> (-0.01%)	⬇️
unit-windows	24.42% <0.00%> (-0.09%)	⬇️

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