Remove AUTH_PROVIDER references

[Josh-XT]

This pull request removes the dependency on the magicalauth authentication provider across various parts of the codebase. The most important changes include updates to the verify_api_key function, removal of the AUTH_PROVIDER environment variable, and adjustments in the MagicalAuth class.

Removal of magicalauth dependency:

• agixt/ApiClient.py: Removed the conditional check for AUTH_PROVIDER in the verify_api_key function.
• agixt/Globals.py: Removed the AUTH_PROVIDER entry from the default environment variables.
• start.py: Removed the AUTH_PROVIDER entry from the default environment variables in the get_default_env_vars function.

Changes in MagicalAuth class:

• agixt/MagicalAuth.py: Removed the conditional check for AUTH_PROVIDER in the verify_api_key function and adjusted the initialization of the encryption_key in the MagicalAuth class. [1] [2] [3] [4]

Docker configuration updates:

• docker-compose-dev.yml, docker-compose-nostreamlit-dev.yml, docker-compose-nostreamlit.yml, docker-compose.yml: Removed the AUTH_PROVIDER environment variable from the services configuration. [1] [2] [3] [4]