Validate parameters before persisting them to `parameters.yaml`

[arvind4501]

When parameter persistence is enabled (OBSAH_PERSIST_PARAMS=true), invalid parameters are written to parameters.yaml without validation . This causes the invalid values to persist across runs, forcing users to encounter the same validation errors on every subsequent execution until they manually edit or reset the parameter.

Steps to Reproduce

1. Enable parameter persistence: OBSAH_PERSIST_PARAMS=true
2. Run a command with an invalid parameter:

   ./foremanctl deploy --add-feature invalid-feature

3. Observe that:
   • The invalid value invalid-feature is written to parameters.yaml
   • A validation error is displayed to the user
   • The command exits with an error
4. Run the command again without any parameters:

   ./foremanctl deploy

5. The same validation error occurs because invalid-feature is loaded from parameters.yaml

Similar issue can be see while Setting tuning higher than the system supports as they persists and blocks all later deployments

Expected Behavior

Parameters should only be persisted after successful validation. If validation fails, the parameter file should remain unchanged.