test,ci: flaky fs_event_error_reporting

[bnoordhuis]

Happened yesterday on the sanitizers-macos buildbot during the "TSAN Test" step:

 not ok 51 - fs_event_error_reporting
# exit code 6
# Output from process `fs_event_error_reporting`:
# Assertion failed in /Users/runner/work/libuv/libuv/test/test-fs-event.c on line 1124: `uv_loop_init(loop) == 0` (-24 == 0)

Errno 24 is EMFILE.

The test tests FSEventStreamStart resource exhaustion by creating 1,024 event loops and file watchers. Maybe needs a setrlimit(RLIMIT_NOFILE) to increase the open file descriptor limit.