1023: Ensure UTF Support

[DmitryMK]

Addresses #1023

• Added tests to verify that reporting service support UTF in both Excel and JSON.
• Added additional tests to check different encodings (latin1, cp1252, utf8) are reported correctly.

[RamilCDISC]

JsonReport.write_report() still uses a with open(self._output_name, "w") and json.dump(report_data, f) without explicit encoding or ensure_ascii=False the json.dump ensure_ascii defaults to True. This can escape non ASCII characters instead of writing them as it is.

[RamilCDISC]

Could we please move this test under regression testing instead? Regression testing folder has similar tests where we run the engine using subprocess.

[RamilCDISC]

The PR ensures UTF-8 encoding for writing the reports and that non-asciii characters are handled properly. The PR was validated by:

1. Reviewing the PR for any unwanted code or comments.
2. Reviewing the PR in accordance with AC.
3. Ensuring all unit and regression testing pass.
4. Ensuring the testing is placed in proper pace and covers the AC.
5. Ensuring the report writing defaults to 'UTF-8'
6. Ensuring both formats (excel and json) both reports handle multilingual characters and non-ASCII characters.
7. Ensuring non-ASCII characters are displayed and intractable in reports.