feat: crmsh watchdog correction, remove obsolete assert for softdog

[marcelmamula]

Enhancement:

• Remove obsolete assert for softdog, which was not working
• Add default softdog, to avoid issue when /dev/watchdog is not present causing SBD service to fail.

Reason:

• Assert code was causing inherent dependency on sbd_watchdog_modules, which should be optional, but it would not work without softdog present.
• Correction after implementing SBD support in https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_ha_pacemaker_cluster

Result:

• Tested and verified on SLES4SAP 15.

Issue Tracker Tickets (Jira or BZ if any):

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.50%. Comparing base (b0f0f96) to head (06093e4). Report is 18 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #217 +/- ## ======================================= Coverage 68.50% 68.50% ======================================= Files 3 3 Lines 181 181 ======================================= Hits 124 124 Misses 57 57 ```

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