fix: [#4684] ESLint issues in botbuilder-lg

[ceciliaavila]

Addresses # 4684
#minor

Description

This PR fixes the new ESLint errors and warnings that occur after upgrading the ESLint packages in the botbuilder-lg project.

Specific Changes

• Removed the 'only-warnings' plugin from 'botbuilder-lg/eslint.config.cjs' file and the related dependency.
• Applied the auto fix flag for most issues (spacing, trailing commas, indentation, and removal of unnecessary eslint exceptions).
• Applied manual fixes for new rules like 'no-require-imports'.

Testing

The following images show the number of issues fixed in the library and the tests passing after the changes.