Add --app-scope option for variables

[pjcdawkins]

Adds --app-scope option to var:create and var:update commands, allowing variables to be scoped to specific applications within a project.

• Option accepts multiple values: --app-scope app1 --app-scope app2
• Validates app names against the current deployment when available
• Skips validation when no deployment exists (e.g., inactive environments)
• Includes integration tests
• The new application_scope property already shows in the variable:get output (without code changes)

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

go-tests/go.mod:3

• Go 1.25 does not exist. As of January 2025, the latest stable Go version is 1.23.x. This should be updated to a valid Go version.

go 1.25

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