Don't Log "Aborted by User" When User is Instructed to Use CTRL+C to Exit

[rmartin16]

Describe the bug
"Aborted by User" should not be logged when the user is instructed to use CTRL+C to exit Briefcase.

To Reproduce
Steps to reproduce the behavior:
Start the Android emulator or iOS simulator via briefcase run and send CTRL+C.

Expected behavior
Briefcase should exit normally.

Screenshots

src/briefcase/integrations/android_sdk.py:            # If the user sends CTRL+C:
src/briefcase/integrations/android_sdk.py:            # Exit normally since the user was instructed to use CTRL+C.
src/briefcase/platforms/android/gradle.py:            "Following device log output (type CTRL-C to stop log)...",
src/briefcase/platforms/iOS/xcode.py:                "Following simulator log output (type CTRL-C to stop log)...",
src/briefcase/platforms/macOS/__init__.py:                    "Following system log output (type CTRL-C to stop log)...",
src/briefcase/platforms/web/static.py:                "Web server log output (type CTRL-C to stop log)...",
src/briefcase/platforms/web/static.py:            # CTRL-C is the accepted way to stop the server.