Refactor all exception handling in code

[KeerthanaAP]

There are several functions in the code that return error messages as plain strings .for example, "Request timed out" or "Error while sending request to url", instead of raising proper exceptions. Since these string-based errors are not consistently checked in the calling code, they can lead to unexpected issues like ValueError, silent failures, or crashes.

For example:
https://github.com/ocp-power-automation/ci-monitoring-automation/blob/main/monitor.py#L1260

if check_if_sensitive_info_exposed function return error, its not handled in the calling function.

possible solution:

1. Raise Exceptions instead of returning strings
2. Add validation in calling code