chore: update files array

[brionmario]

Purpose

This pull request includes changes to the issue template, .npmignore file, and package.json to improve clarity and streamline the project's structure. The most important changes are summarized below:

Improvements to issue template:

• .github/issue_template.md: Changed "Affected Product Version" to "Affected Version" for better clarity.

Project structure simplification:

• lib/.npmignore: Removed reports/ and __tests__/ directories from the ignore list to include them in the npm package.
• lib/package.json: Added a files field to specify which files should be included in the npm package, ensuring only necessary files are published.

Related Issues

• Initialize the repository as a mono-repo, enforce best practices & prepare for the first release 🎉 #4

Related PRs

• N/A

Checklist

• e2e cypress tests locally verified.
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Ran ESLint & Prettier plugins and verified?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?