[EMCAL-718] Cleanup unused EPN workflows

[mfasDa]

As EMCAL fully moved to the synchronous workflow
also for stand-alone processing the old workflow, scripts
and QC configurations can be removed.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2022-pp-apass4
async-2023-pbpb-apass
async-2023-pp-apass1
async-data
async-mc
async-2022-pp-apass6-2023-PbPb-apass2