Switch from lalsuite-extra to lalsuite-waveform-data

Should close llai-deploy-sandboxed#6 (closed).

This is my first time modifying a helm chart so please let me know if there's anything I should have done differently. I tried to follow the conventions that I saw and the general form that it had before my changes.

The alpine/git docker image already has git lfs set up, so git lfs install doesn't need to be run first. I took the bruteforce method of adding all hdf5, hdf, and h5 files to the gitattributes so that git clone will download all of the ROM files right off the bat. There currently aren't any .hdf files in the lalsuite-waveform-data repo, but it's as valid of an extension as .h5 and .hdf5 so I thought including it would future proof us.