Update assertion style in TypeScript ESLint config

[AnirudhOH]

This pull request updates the TypeScript ESLint configuration to enforce the use of the as syntax for type assertions instead of the angle-bracket style. This change is reflected both in the main configuration and in the test snapshot to ensure consistency.

ESLint configuration update:

• Changed the @typescript-eslint/consistent-type-assertions rule to require the as assertion style instead of the angle-bracket style in index.js.

Test snapshot update:

• Updated the corresponding rule in test/rules-snapshot.json to match the new as assertion style.

[Copilot]

Pull Request Overview

This pull request updates the TypeScript ESLint configuration to enforce the as syntax for type assertions instead of angle-bracket syntax, promoting modern TypeScript practices.

• Changed @typescript-eslint/consistent-type-assertions rule from angle-bracket to as assertion style
• Updated test snapshot to reflect the configuration change

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
index.js	Updated ESLint rule configuration to enforce as assertion style
test/rules-snapshot.json	Updated test snapshot to match new assertion style configuration

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