Add new application categories for HTTP traffic management

[alexmoraru7]

This update introduces new application categories for Gateway, enhancing control over outbound traffic. It includes a transition period for remapping existing applications to the new categories.

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[NuelEdeh]

This sentence is runny and conveys 3/4 ideas - makes it confusing

[alexmoraru7]

reworded

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