fix: CodeQL SM04509 issue

[andres-robinet-sw]

#minor

Description

This PR removes eval() from the botbuilder-lg package.
There is no need for side-effects at execution time for the nullSubstitution lambda function.
Additionally, the related CodeQL and ESLint suppressions have been removed, as there is no use for them anymore.

Specific Changes

• Removed unnecesary eval() code.
• Removed ESLint suppression for security/detect-eval-with-expression.
• Removed ESLint suppression for @typescript-eslint/no-unused-vars.
• Removed CodeQL suppression for SM04509.

Testing

The following image shows EvaluationOptions tests passing (along with all other tests).

[coveralls]

Pull Request Test Coverage Report for Build 9370201661

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 84.075%

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Totals
Change from base Build 9214944988:	-0.4%
Covered Lines:	20343
Relevant Lines:	22900

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9370201661

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.431%

---

Totals
Change from base Build 9214944988:	0.0%
Covered Lines:	20425
Relevant Lines:	22900

---

💛 - Coveralls