Update error message to clarify what needs to happen for tests to run #15892
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Update error message to clarify what needs to happen for tests to run
When we get a pull request from outside the protobuf repository, the tests will
not run until a protobuf team member adds the
safe for tests
tag. This changeupdates the error message to make it more clear what has to happen to get the
tests to run.
Fixes #15847.