Delete unused gstlal-inspiral scripts

These files in gstlal-inspiral/bin/ are deleted from the repo since they are replaced by other scripts and won't be called by gstlal jobs anymore:

1. gstlal_bank_splitter
2. gstlal_inspiral_pipe
3. gstlal_inspiral_svd_bank_pipe
4. gstlal_ll_inspiral_pipe
5. gstllal_svd_bank

The scripts are coded with the same warning. For example, https://git.ligo.org/lscsoft/gstlal/-/blob/master/gstlal-inspiral/bin/gstlal_bank_splitter#L42

There are other scripts in gstlal repo that are also not used anymore: https://git.ligo.org/lscsoft/gstlal/-/blob/master/gstlal-ugly/bin/gstlal_psd_pipe#L37

1. gstlal-inspiral/python/inspiral_pipe.py
2. gstlal-ugly/bin/gstlal_psd_pipe
3. gstlal/python/bottle.py
4. gstlal/python/dagparts.py
5. gstlal/python/pipeline.py

We should delete these files as well? @chad-hanna @kipp.cannon @leo.tsukada @patrick.godwin