darc delete-subscriptions --no-pr with multiple matches creates multiple branches #5942
Description
$ darc delete-subscriptions --target-repo dotnet/dotnet --target-branch preview1 --no-pr
results in it creating multiple branches, but I want to have one for a single PR:
info: 'darc/production-1670e59b' branch doesn't exist. Creating it...
info: No configuration file path provided. Trying default location first...
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-1670e59b'...
info: Committing 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-1670e59b via API
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-1670e59b'...
info: Successfully committed 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-1670e59b
info: Successfully deleted subscription with id '0f379a8b-55cc-478b-b49b-0dd1e040f325' from branch '' of the configuration repository https://dev.azure.com/dnceng/internal/_git/maestro-configuration
info: 'darc/production-011ff933' branch doesn't exist. Creating it...
info: No configuration file path provided. Trying default location first...
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-011ff933'...
info: Committing 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-011ff933 via API
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-011ff933'...
info: Successfully committed 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-011ff933
info: Successfully deleted subscription with id 'c54b85de-d632-4863-bf07-38dad593cac9' from branch '' of the configuration repository https://dev.azure.com/dnceng/internal/_git/maestro-configuration
info: 'darc/production-fb223f6d' branch doesn't exist. Creating it...
info: No configuration file path provided. Trying default location first...
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-fb223f6d'...
info: Committing 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-fb223f6d via API
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-fb223f6d'...
info: Successfully committed 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-fb223f6d
info: Successfully deleted subscription with id '32e33204-abe8-4576-adc4-39c7b068a5c9' from branch '' of the configuration repository https://dev.azure.com/dnceng/internal/_git/maestro-configuration
info: 'darc/production-9333407e' branch doesn't exist. Creating it...
info: No configuration file path provided. Trying default location first...
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-9333407e'...
info: Committing 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-9333407e via API
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-9333407e'...
info: Successfully committed 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-9333407e
info: Successfully deleted subscription with id '8b71f5bc-5f84-4881-84ad-432cac6d07a8' from branch '' of the configuration repository https://dev.azure.com/dnceng/internal/_git/maestro-configuration
info: 'darc/production-350cbdb5' branch doesn't exist. Creating it...
info: No configuration file path provided. Trying default location first...
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-350cbdb5'...
info: Committing 1 files to https://dev.azure.com/dnceng/internal/_git/maestro-configuration branch darc/production-350cbdb5 via API
info: Getting the contents of file 'configuration/subscriptions/dotnet-dotnet.yml' from repo 'dnceng/internal/maestro-configuration' in branch/commit 'darc/production-350cbdb5'...