shell autocomplete uses normalize_choice()

[panyamkeerthana]

Shell completion for Choice with enum types doesn't work. When using Choice(MyEnum), autocomplete suggests "MyEnum.foo" instead of "foo", which is the actual accepted value. (#3015) I've changed shell_complete() to use normalize_choice() instead of simply converting choices to strings like in #3017, this does fail the test_choice_case_sensitive() test though.

I can fix the enum autocomplete bug, but there's a decision to make:

A) Manually handle enums, preserve original case

• test_choice_case_sensitive passes as is
• Autocomplete doesn't respect normalize_choice() overrides

B) Use normalize_choice() for consistency (current approach)

• Requires updating test: ["Au", "al"] to ["au", "al"] when case_sensitive=False
• Autocomplete is con sistent with other text behavior

I can amend the current approach to update the test I've just left a note for now! 😃

Closes #3015