skaffold inspect command does not show all supported flags for its subcommands

[aaron-prindle]

Currently if you attempt to list flags for skaffold inspect, the inherited flags from the root command are not shown. UX-wise I believe this is confusing as it would be hard to find all of the supported flags for the command. Below is an example showing this:

aprindle@aprindle ~/skaffold  [inspect-tests-add-test-type]$ skaff inspect build-env list --help
Print the list of active build environments.

Examples:
  # Get list of target build environments with activated profiles p1 and p2
  skaffold inspect build-env list -p p1,p2 --format json

Options:
  -p, --profile=[]: Profile names to activate

Usage:
  skaffold inspect build-env list [flags] [options]

Use "skaffold options" for a list of global command-line options (applies to all commands).

aprindle@aprindle ~/skaffold  [inspect-tests-add-test-type]$ skaffold inspect --help
Helper commands for Cloud Code IDEs to interact with and modify skaffold configuration files.

Available Commands:
  build-env   Interact with skaffold build environment definitions.
  modules     Interact with configuration modules
  profiles    Interact with configuration profiles

Use "skaffold <command> --help" for more information about a given command.

[aaron-prindle]

@gsquared94

[aaron-prindle]

Not sure if this is an issue for other/all skaffold commands, only noticed the issue for skaffold inspect sub-commands