chore: revert back to vite 5 + update vitest (#1116)

### What does this PR do?

There are numerous issues updating to vite 6 is causing us:
* Issues with proper vitest and a failing test
* Blank pages for the extension
* Being forced to use a beta version of vitest to have it build
  correctly.

### Screenshot / video of UI

<!-- If this PR is changing UI, please include
screenshots or screencasts showing the difference -->

### What issues does this PR fix or reference?

<!-- Include any related issues from Podman Desktop
repository (or from another issue tracker). -->

Closes #1107

### How to test this PR?

<!-- Please explain steps to reproduce -->

Be able to use the extension (using pnpm watch and passing in extension
folder) and not having a blank page.

Signed-off-by: Charlie Drage <[email protected]>

package.json

@@ -61,8 +61,8 @@
     "prettier": "^3.4.2",
     "prettier-plugin-svelte": "^3.3.2",
     "typescript": "5.7.2",
-    "vite": "^6.0.3",
-    "vitest": "^2.0.2"
+    "vite": "^5.4.11",
+    "vitest": "^2.1.8"
   },
   "dependencies": {
     "@xterm/addon-attach": "^0.11.0",

packages/backend/package.json

@@ -113,8 +113,8 @@
     "eslint-plugin-sonarjs": "^3.0.1",
     "prettier": "^3.4.2",
     "typescript": "5.7.2",
-    "vite": "^6.0.3",
-    "vitest": "^2.0.2"
+    "vite": "^5.4.11",
+    "vitest": "^2.1.8"
   },
   "dependencies": {
     "semver": "^7.6.3"

packages/frontend/package.json

@@ -52,7 +52,7 @@
     "svelte-markdown": "^0.4.1",
     "svelte-preprocess": "^6.0.3",
     "tailwindcss": "^3.4.17",
-    "vite": "^6.0.3",
-    "vitest": "^2.0.2"
+    "vite": "^5.4.11",
+    "vitest": "^2.1.8"
   }
 }