tests: Speed up the GIO actions test

Merged Philip Withnall requested to merge pwithnall/glib:speed-up-actions-test into master

Reduce the number of iterations of things sent over a mock session bus from different threads, to avoid the test spending quite so long contested over the gsignal.c lock.

The test now takes about 10 seconds, according to time, rather than around 100 or longer.

Signed-off-by: Philip Withnall withnall@endlessm.com

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