fix(help): show GLOBAL OPTIONS for leaf subcommands when HideHelpCommand is true

[TimSoethout]

What type of PR is this?

(REQUIRED)

bug

What this PR does / why we need it:

(REQUIRED)

This PR fixes a help-rendering edge case where enabling HideHelpCommand: true on a parent command caused leaf subcommand help to omit GLOBAL OPTIONS.

[help.go](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/)
    Updates [helpCommandAction](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/) leaf-command detection to use visible commands ([len(cmd.VisibleCommands()) == 0](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/)) instead of raw command count logic affected by the internal help command injection.
    Ensures leaf subcommands consistently render with [CommandHelpTemplate](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/), which includes GLOBAL OPTIONS.
[help_test.go](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/)
    Adds [TestShowSubcommandHelp_GlobalOptions_HideHelpCommand](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/), modeled after [TestShowSubcommandHelp_GlobalOptions](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/).
    Verifies subcommand help still shows inherited persistent/root flags when [HideHelpCommand](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/) is enabled.

Decision rationale:

This keeps existing template responsibilities intact and fixes the root cause (incorrect leaf-command detection), rather than duplicating template sections or altering unrelated help output paths.

Which issue(s) this PR fixes:

(REQUIRED)

Fixes #2268
Special notes for your reviewer:

(fill-in or delete this section)

Review focus: the [helpCommandAction](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/) branch that chooses command vs subcommand help template for case 3/5 flows.
The change is intentionally minimal and scoped to template selection logic plus regression coverage.

Testing

(fill-in or delete this section)

Added regression test:
    [TestShowSubcommandHelp_GlobalOptions_HideHelpCommand](https://automatic-succotash-xgp6xrq4r3p4qr.github.dev/)
Targeted verification:
    go test ./... -run 'TestShowSubcommandHelp_GlobalOptions(_HideHelpCommand)?$'
Full suite verification:
    go test [workspaces](http://_vscodecontentref_/11).

Release Notes

(REQUIRED)

Fix subcommand help output when HideHelpCommand is enabled so GLOBAL OPTIONS remain visible for leaf subcommands.

[Copilot]

Pull request overview

Fixes a help-rendering edge case in helpCommandAction where leaf subcommand help could omit GLOBAL OPTIONS when a parent command sets HideHelpCommand: true, by basing “leaf command” detection on visible subcommands rather than raw cmd.Commands length (which can be affected by internal help command injection).

Changes:

• Update leaf-command detection in helpCommandAction to use len(cmd.VisibleCommands()) == 0.
• Add a regression test to ensure leaf subcommand help still includes GLOBAL OPTIONS when HideHelpCommand is enabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
help.go	Fixes leaf detection for template selection by using visible subcommands, avoiding reliance on injected/hidden help commands.
help_test.go	Adds regression coverage for the HideHelpCommand case to ensure GLOBAL OPTIONS are rendered for leaf subcommands.

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