coredump_disable_* misaligned with DISA STIG

#### Description of problem:

These rules got improved in https://github.com/ComplianceAsCode/content/pull/13665. They now support dropin files, but DISA STIG mandates that the configuration is in /etc/systemd/coredump.conf only.

#### Details:

This content is not aligned with content from DISA.

The misalignment affects these profiles:

- stig
- stig_gui

Both in rhel8 and rhel9 products.

The misalignment affects these rules:

- coredump_disable_backtraces
- coredump_disable_storage

#### Outcome:

- [ ] This project's content can be improved:
- [ ] Check needs to be improved.
- [ ] Remediation needs to be improved.
- [ X] The external content's check is faulty - the other party needs to be notified, they have work to do.

#### SCAP Security Guide Version:

master as of 3b669a6ec4fa4874640cc12a87e4643a03b5a0cf

#### External Content's Version:

RHEL 8 STIG V2R3
RHEL 9 STIG V2R4