bug: q login always prompts for start url and region even if the --identity-provider and --region are provided

[rostcheck]

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

MacOS

Expected behaviour

(This is a parallel of aws/amazon-q-developer-cli#2659, requested to be submitted in parallel by that project's maintainer).

When "q login" is supplied with --license pro, --identity-provider with value, and --region with value, q presents the confirmation URL without requiring the user to enter the identity provider URL and the region.

Actual behaviour

"q login" still asks for the values for the identity provider and region - they are pre-filled, but still require user confirmation.

Steps to reproduce

Run q logout (if previously logged in)
Run q login --license pro --identity-provider "https://your-identity-center.awsapps.com/start" --region us-east-1 --use-device-flow
Observe that the command prompts for confirmation despite providing the parameters. They are pre-filled, but still require user confirmation.

Environment

[q-details]
version = "1.15.0"
hash = "eb8db5c635fc469f3bd94ead16bb4bfb32d7443b"
date = "2025-09-02T17:57:24.662205Z (6d ago)"
variant = "full"

[system-info]
os = "macOS 15.6.1 (24G90)"
chip = "Apple M3"
total-cores = 8
memory = "16.00 GB"

[environment]
cwd = "/Users/USER"
cli-path = "/Users/USER"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "macOS"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.config/q:/Users/USER/.local/bin:/usr/local/mysql/bin:/opt/local/bin:/usr/local/opt/node/bin:/usr/local/opt/python@3.13/libexec/bin:/Users/USER/Library/Python/3.11/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Users/USER/.cargo/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin:/usr/local/share/dotnet:~/.dotnet/tools:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Xamarin Workbooks.app/Contents/SharedSupport/path-bin:/Users/USER/.local/bin:/usr/local/bin:/usr/local/sbin"
QTERM_SESSION_ID = "4c8b2d3909214cf892c0d4d940d0faed"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.15.0"
SHELL = "/bin/bash"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"