tests: Remove various bits of overly-verbose test output

Merged Philip Withnall requested to merge pwithnall/glib:test-verbose-output into main

None of these messages are particularly helpful, but they increase the overall test log output size, which has to be stored by the CI for every test run.

With these messages removed, the size of a full test log is reduced from 6.5MB to 1.8MB for me.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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