Skipping speed tests.

These did not consistently pass on the CI.

From Chad Baker:
... the speedup failing tests can be ignored for now.
We need to come up with a better way of testing the speed
up relative to fastsim-2, but I’m not sure that's an
urgent problem.

python/fastsim/tests/test_speedup.py

@@ -1,9 +1,11 @@
 import time
 import numpy as np
 import fastsim as fsim
+import pytest
 
 n_iters = 5
 
+@pytest.mark.skip(reason = "Ignoring for now")
 def test_hev_speedup():
     # minimum allowed f3 / f2 speed ratio
     min_speed_ratio_si_none = 2
@@ -71,6 +73,7 @@ def test_hev_speedup():
     assert t_fsim2_median / t_fsim3_no_save_median > min_speed_ratio_si_none, \
         f"`min_speed_ratio_si_none`: {min_speed_ratio_si_none:.3G}, median achieved ratio: {(t_fsim2_median / t_fsim3_no_save_median):.3G}"
 
+@pytest.mark.skip(reason = "Ignoring for now")
 def test_conv_speedup():
     # minimum allowed f3 / f2 speed ratio
     # there is some wiggle room on these but we're trying to get 10x speedup