Create vertical integration pathsum test files to match refactored code and test certain features where no real data are available

[huishao-r]

Description

In order to make the pathsum integration generic, the operator was refactored so that the integration can work with any integration weights and summation (e.g. using trapezoidal or rectangle summation). In addition, the in-line computation provides trapezoidal weights using lat, lon and height. The existing test data need to be updated so that the weighting variables are matching the refactored code and dimension.

Dependencies

UFO PR#3903 https://github.com/JCSDA-internal/ufo/pull/3903

[huishao-r]

Created some artificial data to test some features in pathsum operator. The test data were committed in ufo-data PR #531 , together with real observation test files.