Disable the naming-convention eslint rule for models

[JialinHuang803]

This PR is to fix the first error in #3452. It will disable the detection of the naming convention issues in the models.ts file because the internal interfaces that start with '_' should not be detected by this rule.

[Copilot]

Pull Request Overview

This PR updates the ESLint configuration comments in generated model files to suppress the @typescript-eslint/naming-convention rule. The changes address linting issues for internal models with underscore prefixes that would otherwise violate TypeScript naming conventions.

Key changes:

• Adds /* eslint-disable @typescript-eslint/naming-convention */ to all generated model files
• Updates the comment description to clarify that the rule disables apply to both internal models with _ prefix and deserializers requiring any
• Modifies the comment from "This file contains only generated model types and (de)serializers" to "This file contains only generated model types and their (de)serializers"

Reviewed Changes

Copilot reviewed 31 out of 58 changed files in this pull request and generated no comments.

File	Description
packages/typespec-ts/src/modular/emitModels.ts	Updates the model file header comment template to include the naming-convention eslint disable rule and clarifies the comment about what rules are being disabled
packages/typespec-ts/test/modularUnit/scenarios/**/*.md	Updates test snapshots to reflect the new header comment format in generated model files
packages/typespec-test/test/**/models.ts	Updates generated model files with the new header comment format including the naming-convention eslint disable

[MaryGao]

Approved. are we resolved all lint issues if yes please help enable the lint check in package.json?