Fix Python client not respecting CORTEX_CLI_CONFIG_DIR environment variable for client-id.txt

[jackmpcollins]

Currently, the python client does not respect the CORTEX_CLI_CONFIG_DIR environment variable when locating "client-id.txt" while creating the default scope for sentry. This results in two "client-id.txt" files with different uuids when this environment variable is set - one created by the cortex CLI in the specified directory and the other created by the python client in ~/.cortex. This PR fixes this by using cli_config_dir() to locate client-id.txt when creating the sentry default scope.

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checklist:

• run make test and make lint
• test manually (i.e. build/push all images, restart operator, and re-deploy APIs)
• update examples
• update docs and add any new files to summary.md (view in gitbook after merging)
• cherry-pick into release branches if applicable
• alert the dev team if the dev environment changed

[CLAassistant]

All committers have signed the CLA.

[miguelvr]

LGTM

[miguelvr]

@jackmpcollins just run make format to fix the linting errors

[RobertLucian]

Good catch Jack! LGTM!