frontend: Fix bundled icons and the test

[sniok]

This PR fixes the icons test that checks that all icons are bundled properly
And updates all the latest icons to be included in the bundle

Related Issue

Fixes #3919 #3886

Steps to Test

1. Start headlamp without internet
2. Check that all the icons are visible

[Copilot]

Pull Request Overview

This PR fixes the bundled icons test and updates icon definitions to ensure all icons are properly cached for offline use. It refactors the test to use a base directory parameter and updates the icon data with improved SVG paths and new icon definitions.

• Fix the icons test by adding a baseDir parameter to the file filter function
• Update all existing icon SVG paths with HTML entity encodings
• Add new icon definitions and aliases to support additional UI elements

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
frontend/src/filesFilter/filesFilter.ts	Add optional baseDir parameter to support custom base directories for file filtering
frontend/src/components/App/icons.ts	Update icon SVG paths with HTML entities and add numerous new icon definitions and aliases
frontend/src/components/App/icons.test.ts	Refactor test to use baseDir parameter and improve error reporting for missing icons

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[illume]

Needs tests.

[sniok]

Needs tests.

what do you mean? this PR fixes the test that was broken

[joaquimrocha]

Code looks fine.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joaquimrocha, sniok

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [joaquimrocha,sniok]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment