Add entry for JavaScript Array.prototype.entries()

[LariRaupp]

Description

Hi! I commented on the issue asking to work on this but haven’t been assigned yet.
Since I’ve already completed the entry following the contribution guidelines, I’m opening this PR in advance.

This PR adds a new entry for Array.prototype.entries() under:

content/javascript/concepts/arrays/terms/entries/entries.md
The entry includes:

• A clear description of the method
• A syntax section with usage format
• A real-world example using an array of my cats' names
• A codebyte block with a simple, compilable example
• A brief notes section and related references

Issue Solved

Closes #7090

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.