Run --help on all commands in CI task

[derekbekoe]

Closes #4224

This change also speeds up our CI jobs as it executes the two main tasks in parallel.

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This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• The PR has modified HISTORY.rst with an appropriate description of the change (see Modifying change log).

Command Guidelines

• Each command and parameter has a meaningful description.
• Each new command has a test.

(see Authoring Command Modules)

[codecov-io]

Codecov Report

Merging #4327 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #4327   +/-   ##
======================================
  Coverage      70%     70%           
======================================
  Files         475     475           
  Lines       29919   29919           
  Branches     4627    4627           
======================================
  Hits        20945   20945           
+ Misses       7490    7486    -4     
- Partials     1484    1488    +4

Impacted Files	Coverage Δ
...dback/azure/cli/command_modules/feedback/custom.py	31.25% <0%> (ø)	⬆️
...nent/azure/cli/command_modules/component/custom.py	16.26% <0%> (ø)	⬆️
...li-cloud/azure/cli/command_modules/cloud/custom.py	13.79% <0%> (ø)	⬆️
src/azure-cli-core/azure/cli/core/util.py	69.73% <0%> (ø)	⬆️

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[tjprescott]

LGTM.

[tjprescott]

I believe this should fix #4224, right @derekbekoe ?

[derekbekoe]

Thanks yes it does. Added to PR desc.