Resolve "Resolve threads from MR !631"

What this MR does / why we need it:

This MR adds a csts version of the data_sink_qdac_test_app and its assembly. Also, this MR includes some minor changes:

• Remove assets/applications/fsk_csts_dig_radio_ctrlr/fsk_modem_csts_app.xml directory as the regular app can be run using the default version.
• Remove double comments in /platform/hdl/devices/data_sink_qdac_csts.hdl/Makefile Makfile.
• Remove all duplicate non-csts containers in assets/hdl/assemblies/fsk_modem_csts directory.
• Remove superfluous added newline in platform/hdl/primitives/dac_csts/dac_csts.xml file.

Note, contrary to the branch name, the primitive/hdl/devices Make-less changes are not included in this MR.

Release Notes

• The data_sink_qdac_test_app_csts does not work in network mode, but does work in server mode. (the current default cswm version does not work in server mode, but does work in network mode, which is the inverse)

Steps to complete before submitting MR:

• I have read Contribution guidelines

Changelog

• bug(application, protocols, test): remove superfluous code and empty lines and include data_sink_qdac_test_app_csts

Which issue(s) this MR closes

Closes #2377 (closed)