Ensure naming-convention-violation does not check variables in main block

[david-yz-liu]

Motivation and Context

The naming-convention-violation error was being flagged for variables defined within a main block. However, this was unintentional (and inconsistent with the global variables checker), as instructors sometimes like to use the main block to write demo code to provide to students.

Your Changes

Description: Update the naming-convention-violation check to exclude variables in the main block.

Type of change (select all that apply):

• Bug fix (non-breaking change which fixes an issue)

Testing

Tested manually and added an additional test case.

Questions and Comments (if applicable)

Checklist

• I have performed a self-review of my own code.
• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported on Coveralls.
• I have added tests for my changes.
• I have updated the CHANGELOG.md file.

[coveralls]

Pull Request Test Coverage Report for Build 7160263097

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 94.606%

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Totals
Change from base Build 7160206745:	0.002%
Covered Lines:	3420
Relevant Lines:	3615

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💛 - Coveralls