Merge branch 'mw/bash-prompt-show-untracked-config'

Allows skipping the untracked check GIT_PS1_SHOWUNTRACKEDFILES asks for the git-prompt (in contrib/) per repository. * mw/bash-prompt-show-untracked-config: t9903: add extra tests for bash.showDirtyState t9903: add tests for bash.showUntrackedFiles shell prompt: add bash.showUntrackedFiles option