Fix tuple conversion in draw_text_on_image function, improve test_image_translator ,and add tests for image_utils.py

[skytin1004]

Purpose

Description

1. The draw_text_on_image function had a bug where the size of the text was incorrectly handled as a list instead of a tuple. This has been corrected to ensure proper functionality.
2. Several improvements were made to the test cases for test_image_translator to ensure proper testing of bounding box extraction and image translation.
3. Added tests for image_utils.py

Related Issue

#15

Does this introduce a breaking change?

When developers merge from main and run the server, azd up, or azd deploy, will this produce an error?
If you're not sure, try it out on an old environment.

• Yes
• No

Type of change

• Bugfix
• Feature
• Code style update (e.g., formatting, local variables)
• Refactoring (no functional or API changes)
• Documentation content changes
• Other... Please describe:

Checklist

Before submitting your pull request, please confirm the following:

• I have thoroughly tested my changes: I confirm that I have run the code and manually tested all affected areas.
• All existing tests pass: I have run all tests and confirmed that nothing is broken.
• I have added new tests (if applicable): I have written tests that cover the new functionality introduced by my code changes.
• I have followed the Co-op Translators coding conventions: My code adheres to the style guide and coding conventions outlined in the repository.
• I have documented my changes (if applicable): I have updated the documentation to reflect the changes where necessary.

Additional context

[skytin1004]

I have reviewed the changes and everything looks good.