set_nonfatal_assertions

Changes the behaviour of the various assertion macros.

The `g_assert_*()` macros, `g_test_assert_expected_messages()` and the various `g_test_trap_assert_*()` macros are changed to not abort to program.

Instead, they will call [func@GLib.test_fail] and continue. (This also changes the behavior of [func@GLib.test_fail] so that it will not cause the test program to abort after completing the failed test.)

Note that the [func@GLib.assert_not_reached] and [func@GLib.assert] macros are not affected by this.

This function can only be called after [func@GLib.test_init].