Docs: Add JSDoc to privacy tools JavaScript

[yusufhay]

Trac ticket: https://core.trac.wordpress.org/ticket/49381

This refreshes the JavaScript documentation work for privacy-tools.js with focused JSDoc blocks for the internal privacy request helper functions.

The documented functions cover action state handling, result notice rendering, export progress, and erasure progress.

Testing:

• node --check src/js/_enqueues/admin/privacy-tools.js
• git diff --check -- src/js/_enqueues/admin/privacy-tools.js

Notes:

• Full JS lint was not run because dependencies are not installed in this clean worktree.

[github-actions]

Hi @yusufhay! 👋

Thank you for your contribution to WordPress! 💖

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[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Props yusufmudagal.

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[yusufhay]

Thanks for the guidance!

This PR is linked to the Trac ticket in the description: https://core.trac.wordpress.org/ticket/49381

This is a documentation-only JavaScript change, so I did not add automated tests. I ran the following checks locally:

node --check src/js/_enqueues/admin/privacy-tools.js
git diff --check -- src/js/_enqueues/admin/privacy-tools.js

[github-actions]

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