test: Add support and unit tests for handling of multiple files passed as a pattern in data_config

[Abhishek-TAMU]

Description of the change

Added unit test for testing handling of multiple files passed as a pattern in data_config yaml file.

List of supported/not supported examples for the feature of passing files via pattern:

Not supported: Passing all files of the directory with /* without mentioning the type of extension
For example: /path/to/directory/*

Supported: Passing all files of the directory with /* along with mentioning the type of extension
For example: /path/to/directory/*.json OR /path/to/directory/*.arrow OR /path/to/directory/*.parquet

Not supported: Passing files of the directory which matches any pattern for example*input_output* without mentioning the type of extension. For example: /path/to/folder/*input_output*

Supported: Passing files of the directory which matches any pattern for example *input_output* along with mentioning the type of extension.
For example: /path/to/folder/*input_output*.json OR /path/to/folder/*input_output*.parquet OR /path/to/folder/*input_output*.arrow

Related issue number

https://github.ibm.com/ai-foundation/watson-fm-stack-tracker/issues/1487

How to verify the PR

Verify unit test additions.

Was the PR tested

• I have added >=1 unit test(s) for every new method I have added.
• I have ensured all unit tests pass

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[Abhishek-TAMU]

Moved to PR: #424