refactor: fix code misc. code quality issues

[sanketsaurav]

Changes:

This PR fixes multiple occurrences of the following code quality issues found by DeepSource's Autofix™ AI on this project.

Issues:

• Unnecessary use of dict()
• Handle unguarded next()
• Subsequent if statements which can be merged
• Replace unused variables with _
• Use f-strings instead of .format()
• Unnecessary use of None default in os.environ.get()