Update rich_progress.py

[Tribhuvan0]

Adapts the color of progress bar according to the color of system background

What does this PR do?

Implemented RichProgressBarTheme with a new feature to detect the terminal background color and adjust the styles based on it. The terminal background color is detected using the Console class from the rich library. If the terminal supports truecolor, the TERMINAL_BG_COLOR environment variable is checked, otherwise, it is assumed to be a dark theme.

This implementation allows the RichProgressBar to be visible by default in both light and dark themes without requiring users to modify the theme.

Fixes #17118 Note: I am a beginner in open source, and haven't contributed to big codebases yet, if there is any issue please let me know

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