Do not print project configuration on every invocation #2140

While showing the effective configuration bst is running in can be a useful debugging tool, it really clutters the tool's output and most of the times scrolls by too fast to evaluate anyway. When using bst on a terminal it really adds to the clutter of printed output and making it really hard to scroll to navigate anywhere in that shell.

IMHO it should be shown only when a flag like --print-configuration or just --verbose is given and not otherwise.

I can understand why it is useful for CI environments to always show it, but for those cases I feel like it should just be controlled by the verbose flag and CI environments should configure that.