fix test for BranchSyncCommand
fix CoreInitCommandTest
fix PullRequestMergeCommandTest
fix PullRequestSquashCommandTest
fix PullRequestCreateCommand

- use root-config for base and remove-promote
- update tests
fix IssueTakeCommandTest
fix CoreConfigureCommand

- continue when config file is present but invalid
- do not load local configuration when configuring
fix PullRequestFixerCommandTest