Request recording can't be enabled when running tests

[apotterri]

It should be possible to enable request recording when running tests by setting APPMAP_RECORD_REQUESTS=true. Currently, it's not:

appmap-python/_appmap/testing_framework.py

Line 120 in 4ada3fe

with rec, environ.disabled("requests"):

appmap-python/_appmap/env.py

Lines 129 to 132 in 4ada3fe

	def disabled(self, recording_method: str):
	key = _recording_method_key(recording_method)
	value = self.get(key)
	self.set(key, "false")