Add secret management via infisical

[Adityav369]

No description provided.

[jazzberry-ai]

Bug Report

Name: .env file always loaded, overriding secret manager values
Severity: High
Example test case: Set SECRET_MANAGER to 'infisical' in morphik.toml, set environment variables in Infisical, and also set the same environment variables in .env. The values from .env will be used instead of Infisical.
Description: The load_local_env(override=True) call in core/config.py is unconditional, causing it to always load environment variables from the .env file, even when a secret manager like Infisical is configured. This overrides the values provided by the secret manager.

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