[v3-0-test] Fix module loading in logging config (#54555)

[github-actions]

• fix(logging): fix module loading by using import_module()

• Replace import_string() with import_module() in load_logging_config()
• Fix issue where simple module paths like log_config.LOGGING_CONFIG failed
• Add importlib import inside function to avoid circular imports

• test(logging): add tests for logging config module path handling

• Add parametrized test for simple and nested module paths
• Add test for graceful fallback when remote logging vars are missing
• Create helper method to reduce test code duplication
• Test both log_config.LOGGING_CONFIG and nested.module.LOGGING_CONFIG scenarios

Ensures logging config works with various module path structures

• fix(logging): fix module loading by using import_module()

• Replace import_string() with import_module() in load_logging_config()
• Fix issue where simple module paths like log_config.LOGGING_CONFIG failed
• Add importlib import inside function to avoid circular imports

• test(logging): add tests for logging config module path handling

• Add parametrized test for simple and nested module paths
• Add test for graceful fallback when remote logging vars are missing
• Create helper method to reduce test code duplication
• Test both log_config.LOGGING_CONFIG and nested.module.LOGGING_CONFIG scenarios

Ensures logging config works with various module path structures

• fix(logging): fix module loading by using import_module()

• Replace import_string() with import_module() in load_logging_config()
• Fix issue where simple module paths like log_config.LOGGING_CONFIG failed
• Add importlib import inside function to avoid circular imports

• test(logging): add tests for logging config module path handling

• Add parametrized test for simple and nested module paths
• Add test for graceful fallback when remote logging vars are missing
• Create helper method to reduce test code duplication
• Test both log_config.LOGGING_CONFIG and nested.module.LOGGING_CONFIG scenarios

Ensures logging config works with various module path structures

• refactor(logging): move import_module to the top level

• test(logging): optimize test constants to reduce code duplication

Replace SETTINGS_FILE_NESTED_MODULE replicate part with string replacement from SETTINGS_FILE_SIMPLE_MODULE

• test(logging): use shared helper method for logging config validation

Replace manual assertions with self._verify_basic_logging_config in fallback test to ensure consistent validation across all logging config tests.

• refactor(logging_config): simplify, improve test config vars

• Remove redundant SETTINGS_FILE_NESTED_MODULE
• Rename SETTINGS_FILE_SIMPLE_MODULE to SETTINGS_FILE_WITH_REMOTE_VARS

• refactor(logging): imporve & simplify logging testing file

1. remove SETTING_FILE_NO_REMOTE_VARS bcz redundant var
2. add return typo with _verify_basic_logging_config
3. add unittest.mock call
   (cherry picked from commit 462ce9a)

Co-authored-by: Vic Wen [email protected]