[Tests] Fix: Accept uppercase calibration type

Description

Triggering this pipeline failed because I gave an uppercase value for the CALIBRATION variable. This led to and error: __main__.py: error: argument --calibration: invalid choice: 'DARK' (choose from 'correct', 'dark', 'all').

I have added this fix to accept uppercase values and compare it against the lowercase choices.

How Has This Been Tested?

Rebased onto fix/lpd-dark-daemon-children and will run the test with the same failed variables' values.

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

tests/test_reference_runs/conftest.py

@@ -9,9 +9,7 @@ def pytest_addoption(parser):
         default=False,
         help="Start release test for all supported calibration notebooks",
     )
-    # detectors_choices = []
-    # for k in ['agipd', 'jungfrau', 'pnccd', 'epix100', 'all']:
-    #     detectors_choices += [k, k.upper()]
+
     parser.addoption(
         "--detectors",
         default=["all"],
@@ -20,7 +18,7 @@ def pytest_addoption(parser):
 
     parser.addoption(
         "--calibration",
-        type=str,
+        type=str.lower,
         choices=["correct", "dark", "all"],
         default="all",
     )