refactor: sort the region and location in constants.py

[jialuoo]

1. Sort the regions and locations so it's easier for future updates.
2. Remove duplicate entries in BIGQUERY_REGIONS ("me-central1", "me-central2", and "me-west1").

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> 🦕