fix(cli): handle missing [codecarbon] section and write api_endpoint via ConfigParser

[sohammishra864-wq]

Description

• get_config() now returns {} instead of None when the config file has no [codecarbon] section.
• get_api_endpoint() now sets the default api_endpoint through ConfigParser instead of raw-appending a line, so it always lands under [codecarbon].

Related Issue

Fixes #1432

Motivation and Context

show_config() crashed with TypeError on a config file that had no [codecarbon] section. get_api_endpoint() wrote the key under the last section of multi-section files, so it was never found and got appended again on every call.

How Has This Been Tested?

Added two tests in tests/cli/test_cli_utils.py. Both fail on master and pass with this change. pytest tests/cli: 76 passed.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

AI Usage Disclosure

• 🟥 AI-vibecoded
• 🟠 AI-generated
• ⭐ AI-assisted
• ♻️ No AI used

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the docs/how-to/contributing.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[davidberenstein1957]

Fixes #1432 cleanly: get_config returning {} and writing api_endpoint through ConfigParser puts the key under [codecarbon] where the reader expects it. One thing worth knowing: config.write rewrites the whole file, so comments in an existing .codecarbon.config are dropped. Acceptable for a config file we own, but a line in the PR description would help.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.07%. Comparing base (7929a4f) to head (cf448b8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1433   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          49       49           
  Lines        5199     5200    +1     
=======================================
+ Hits         4787     4788    +1     
  Misses        412      412           

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