Temporarily enable gpu marked functional tests by default

This is just to get a CI signal from these functional tests to see
where things stand without actually porting them to run on GPU runners yet.

Signed-off-by: Ben Browning <[email protected]>

tox.ini

@@ -18,7 +18,7 @@ deps = -r requirements-dev.txt
 commands =
     unit: {envpython} -m pytest {posargs:tests --ignore=tests/functional}
     unitcov: {envpython} -W error::UserWarning -m pytest --cov=instructlab.sdg --cov-report term --cov-report=html:coverage-{env_name} --cov-report=xml:coverage-{env_name}.xml --html=durations/{env_name}.html {posargs:tests --ignore=tests/functional -m "not (examples or slow)"}
-    functional: {envpython} -m pytest {posargs:tests/functional -m "not gpu"}
+    functional: {envpython} -m pytest {posargs:tests/functional}
 
 # format, check, and linting targets don't build and install the project to
 # speed up testing.