🗑️ Removed secret content Azure functions and containers

[babakamyljanovssw]

Issue: https://github.com/SSWConsulting/SSW.Rules/issues/1622

This pull request includes removal SecretContent and User entities related to secret content feature, along with their related functions and cosmos db configurations. The secret content wasn't being used and maintained causing huge amount of failure logs on Application Insights

Removal of Entities and Functions:

• Removed the SecretContent entity class.
• Removed the User entity class.

Changes in Functions:

• Removed the creation and check of SecretContent entity in the health check function.
• Deleted the GetSecretContentFunction class.
• Deleted the AddUserOrganisationFunction class.
• Deleted the GetOrganisationsFunction class.
• Deleted the GetUserFunction class.

Database Configuration Updates:

• Removed SecretContent and User repositories from the RulesDbContext class.
• Removed container configurations for SecretContent and User entities.

Documentation Updates:

• Removed API endpoints related to SecretContent and User functions.

[babakamyljanovssw]

Hey @bradystroud @JackDevAU

Merging this PR, I've exported SecretContent and User containers as json object to my local just in case. This merge will update the DB scheme, but it will not delete containers from Azure Cosmos DB, containers needs to be deleted manually.