TLDR; Go to account settings and turn the
Console  Enable console messages off.
Couple of days ago I was surprized to see this rainbow Bitbucket logo when I pushed commits to my repository.
After some reasearch I found this thread where was explanation that by this
Atlassian supports equality, including the global LGBT population
which is great, I fully agree with equality, but not when it appears without my permision and hide a full screen of terminal history.
So, if you want to keep your terminal clean, go to your account settings and turn the option
Enable console messages off.
Happy coding without any distractions!