Makefile: Fix multi codeowner detection #40923
Merged
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Previously when multiple code owners were specified, the extra files
would be passed as separate arguments, but the subsequent commands
expect them to be specified in the form "file1,file2". Emit them as
comma-separated values instead of space-separated.
Fixes: dda3976 ("Fix code owner attribution for test failures on stable branches")
Fixes: #40776
Related: #40847