This update introduces a new feature to calculate and process the Belgian ONSS cotisation 863, a mandatory contribution for employees. The change utilizes predefined rates from a configuration file and integrates this functionality into the existing payroll processing system (dmfa).

add ONSS cotisation (input rule) and using Rates defined in "NOSSContributionRate_2026_1.xml" and add it to dmfa

Task Id: 6259645

This update adds a new filter to the salary rule search view, allowing users to specifically search for rules related to the Joint Committee (JC). This enhancement improves the ability to locate and manage salary rules based on this important committee, streamlining HR processes.

This PR expected to Add Joint Committe field on search salary search view, with creteria: 
`JC is not set or JC contains %search%) && excluded JC does not contain %search%`

task:6285374