chore: clean up E-Signet / OIDP verification button code

[naftis]

Cleaning up any hard-coded code regarding to OIDP/E-Signet functionality. This code can be referred to when re-implemented into @opencrvs/mosip repository, but we want to separate it from core for enhancing opencrvs-core modularity.

The code will be brought back non-hardcoded into core in #6954

[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-up-esignet.opencrvs.dev