Remove TGUI build artifacts (#21657)

# Summary

This PR removes the already checked-in build artifacts generated from
the TGUI build stage.
This should prevent further merge-conflicts and confusion about file
changes that have not been made by the user.

## Changes

- Remove already checked-in TGUI bundle files listed in gitignore.
- Removed manually executed workflow for TGUI update, responsible for
re-adding auto-generated files.

<img width="190" height="311" alt="image"
src="https://github.com/user-attachments/assets/a2e1aaf1-13a6-45df-858a-765e7dd66af1"
/>

.github/workflows/update_tgui.yml

@@ -1,38 +0,0 @@
-name: "Build TGUI"
-on:
-  workflow_dispatch:
-
-jobs:
-  update-tgui:
-    concurrency: tgui
-    runs-on: ubuntu-24.04
-    steps:
-    
-    - name: Checkout Repository
-      uses: actions/checkout@v4
-      with:
-        token: ${{ secrets.BOT_TOKEN_AURORA }}
-        
-    - name: Install Node
-      uses: actions/setup-node@v3
-      with:
-        node-version: 14
-        cache: 'yarn'
-        cache-dependency-path: tgui/yarn.lock
-
-    - name: Update TGUI
-      run: |
-        tools/bootstrap/node tools/build/build.js tgui
-
-    - name: Commit TGUI
-      run: |
-        git pull origin master
-        git config --local user.email "action@github.com"
-        git config --local user.name "AuroraBuildBot"
-        git add --force tgui/public/*
-        git commit -m "Automatic TGUI compile [ci skip]" -a || true
-
-    - name: Push
-      uses: ad-m/github-push-action@master
-      with:
-        github_token: ${{ secrets.BOT_TOKEN_AURORA }}