To detect whether conformance tests have been changed, the test
argument with the `ConformanceIt` is recorded to conformance.txt.
This change remove additional tags (e.g., [Feature:]) and trim spaces,
so that the detection is less-prone to noise.
This change also updates conformance.txt with normalized names.
This test creates a golden list of existing conformance tests. Efforts
to add or remove conformance tests will require you to rebuild the
golden list, and changes to the golden list will be reviewed by
sig-architecture.