user: MkdirAllAndChown, MkdirAndChown: DRY

[thaJeztah]

No description provided.

[Copilot]

Pull request overview

This PR refactors directory-creation helpers in user/ to reduce duplicated option parsing by forwarding MkdirOpt variadic options directly into the platform-specific mkdirAs implementation.

Changes:

• Simplifies MkdirAllAndChown and MkdirAndChown to forward opts ...MkdirOpt directly to mkdirAs.
• Updates mkdirAs (unix/windows) signatures to accept opts ...MkdirOpt and parses options inside the unix implementation.
• Switches unix logic from onlyNew parameter usage to options.onlyNew.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
user/idtools.go	Removes duplicated option parsing in public wrappers by forwarding opts to mkdirAs.
user/idtools_windows.go	Updates mkdirAs signature to accept variadic MkdirOpt on Windows.
user/idtools_unix.go	Updates mkdirAs signature and moves MkdirOpt parsing into the unix implementation.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

Suppressed comments (2)

user/idtools_unix.go:29

• The comment below still refers to an onlyNew boolean parameter, but mkdirAs now takes variadic MkdirOpts and derives onlyNew from options.onlyNew. Updating the comment will keep it accurate and avoid confusion about how the behavior is controlled.

		if options.onlyNew {

user/idtools_windows.go:9

• Typo in the preceding comment: "could be support here" should be "could be supported here".

func mkdirAs(path string, _ os.FileMode, _, _ int, _ bool, _ ...MkdirOpt) error {