Fix auto-generation of unwanted sk-xxx file

[thekaranacharya]

Previously, the file was automatically generated during the execution of tests in this file using pytest. The file's contents were as follows:

# TLS secrets log file, generated by OpenSSL / Python

• It was discovered that mocking os.environ.get was causing the file generation. Despite thorough research, no specific cause was identified.
• After removing these mocks, the file is no longer generated, and all tests pass. It appears that the mocking was unnecessary with one exception: The mocking of os.environ is required only at one location to avoid complaints about the absence of an OpenAI API key.
• Additionally, some other mocks have been updated.