chore: clean up MOSIP code

[naftis]

Core PR: #7879
Farajaland PR: opencrvs/opencrvs-farajaland#1149
Countryconfig PR: opencrvs/opencrvs-countryconfig#309

This PR removes any MOSIP code handling that is not related to systems/integrations or the national ID webhooks. Let's clean those up when the MOSIP epic gets refined.

[github-actions]

Oops! Looks like you forgot to update the changelog. When updating CHANGELOG.md, please consider the following:

• Changelog is read by country implementors who might not always be familiar with all technical details of OpenCRVS. Keep language high-level, user friendly and avoid technical references to internals.
• Answer "What's new?", "Why was the change made?" and "Why should I care?" for each change.
• If it's a breaking change, include a migration guide answering "What do I need to do to upgrade?".

[ocrvs-bot]

Your environment is deployed to https://clean-mosip.opencrvs.dev