Fix pytensor_cache clear

[ricardoV94]

I noticed cache clear wasn't working and always used purge instead. It was a mistake introduced by 671a821 (downstream of aesara-devs/aesara#1312).

This changed many time.time() to to time.perf_counter(). But here it was a mistake. The units are wrong for the logic used in refresh to denote files that are "too old", as it compares the age of a file with the os stats:

pytensor/pytensor/link/c/cmodule.py

Lines 369 to 375 in 8ebff26

	def last_access_time(path):
	"""
	Return the number of seconds since the epoch of the last access of a
	given file.
	"""
	return os.stat(path)[stat.ST_ATIME]

The whole thing is a bit over-engineered but I don't want to touch it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (17c675a) to head (8ebff26).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #1694       +/-   ##
==========================================
- Coverage   81.61%       0   -81.62%     
==========================================
  Files         242       0      -242     
  Lines       53537       0    -53537     
  Branches     9433       0     -9433     
==========================================
- Hits        43695       0    -43695     
+ Misses       7366       0     -7366     
+ Partials     2476       0     -2476     

see 242 files with indirect coverage changes

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