Add detailed Long help text for env get and env update

[Copilot]

gh aw env get and gh aw env update only exposed one-line summaries, leaving default file behavior and scope/flag semantics unclear. This PR adds actionable long-form help for both subcommands so users can understand scope resolution and update-mode flag interactions directly from --help.

• Help text coverage

  • Added Long: docs to env get [file] and env update [file].
  • Documented default file behavior (file.yml) when no positional file is provided.
  • Documented scope behavior (repo|org|ent), including inference from --repo/current repo and --enterprise requirements.
  • Clarified update-specific flag semantics:
    • --scope is required
    • --dry-run previews and does not apply changes
    • --yes only affects real updates (confirmation bypass), not dry runs

• Regression protection

  • Extended TestNewEnvCommand to assert meaningful long-help presence and key concepts for both subcommands without coupling tests to brittle exact phrasing.

cmd := &cobra.Command{
    Use:   "update [file]",
    Short: "Upload defaults from a YAML file",
    Long: `Upload compiler defaults from a YAML file.

When [file] is omitted, the command reads from file.yml.

Scope and flag behavior:
- --scope is required (repo|org|ent).
...
- --dry-run previews planned changes and exits without applying updates.
- --yes skips the confirmation prompt for real updates; it has no effect with --dry-run.`,
}

[Copilot]

Pull request overview

Adds long-form --help documentation for gh aw env get and gh aw env update to make default file behavior, scope inference, and update-mode flag interactions discoverable directly from command help output.

Changes:

• Added Long: help text to env get [file] describing default output file (file.yml) and scope resolution rules.
• Added Long: help text to env update [file] describing default input file (file.yml), required --scope, and --dry-run / --yes semantics.
• Extended TestNewEnvCommand to assert that both subcommands have meaningful long help mentioning key concepts/flags.

Show a summary per file

File	Description
pkg/cli/env_command.go	Adds detailed Long help text for env get and env update, documenting file defaults, scope resolution, and update flags.
pkg/cli/env_command_test.go	Adds assertions ensuring the new long help text exists and references key concepts/flags.

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