[tooling] adds non-hailtop subdirs to pylint ignore

[iris-garden]

We only have make commands for running pylint on subdirectories that have been kept up to date with its rules, but the pylintrc doesn't actually contain any indication of which subdirectories should be ignored when running pylint. This makes the use of language servers that run pylint on the file that's open frustrating, as files in the ignored subdirectories will often be full of pylint suggestions. This change adds the relevant subdirectories to the pylintrc file. Note that this does not necessarily enable us to run pylint directly on those subdirectories with the equivalent make commands to the ones that already exist, because there is no way that I've found to make pylint ignore the __init__.py file of whatever module it's being run on, so running it on hail/python/hail, for example, produces many errors.