improved and readable validate.py

[FardinHash]

Why is this PR required?

To make this code bit improvised and more readable.

What changes have been made?

• Imported modules are grouped and sorted alphabetically
• Used standard library modules are imported at the top
• The release_notes dictionary is initialized at the beginning
• The date field in release_notes is set using datetime.now()
• The try-except block in package_manager_validation is simplified and only returns an empty dictionary in case of error
• The code in if name == "main": is reorganized and the order of the dictionary keys is consistent with their appearance in the output JSON file
• The JSON file is written using json.dump() instead of json.dumps() followed by f.write() for better readability and safety

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