First run message should be printed to stderr and/or not be printed when CI=true #139737
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Use case
We (at pub.dev) have scripts that parse flutter --version --machine
Recently the welcome message started printing at the end of the output making the parsing fail causing: dart-lang/pub-dev#7264
Proposal
In general it would be easier to handle the output of the flutter tool in a reliable manner if this message was output to stderr instead of stdout.