[TASK] Add composer command for phpstan and use it in CI

10 jobs for task/add-phpstan in 3 minutes and 14 seconds (queued for 7 seconds)
Name Stage Failure
failed
test:rector Test
         files in "$parameters->set(Option::AUTOLOAD_PATHS, [...]);" or         
"$parameters->set(Option::BOOTSTRAP_FILES, [...]);" in "rector.php"
config.
See https://github.com/rectorphp/rector#configuration".

! [NOTE] 2 files were added

Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
test:phpstan Test
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[ERROR] Found 2 errors



Script phpstan analyze extensions/ handling the test:phpstan event returned with error code 1
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1