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The upstream commit dda3976 ("Fix code owner attribution for test
failures on stable branches") recently updated the tree to detect and
use the TESTOWNERS file to determine ownership for test failures on
stable branches. While the backport for this is pending, the TESTOWNERS
file is not yet prepared on that branch. This commit does exactly that.
This introduces the TESTOWNERS file to be the same as the CODEOWNERS
file prior to the v1.18 branch point, which is to say at commit
cdf8de6 ("CODEOWNERS: move pkg/logging to sig-agent").
In conjunction with #40847, this should make the v1.18 branch behave correctly
with respect to #40583.