chore(traefik): move ingressclass under ingress section and hide behind expert button (#9225)

**Description**
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⚒️ Fixes  #9142

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**
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**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ ] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

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charts/enterprise/traefik/Chart.yaml

@@ -23,7 +23,7 @@ sources:
   - https://github.com/traefik/traefik-helm-chart
   - https://traefik.io/
 type: application
-version: 18.0.6
+version: 18.0.7
 annotations:
   truecharts.org/catagories: |
     - network

charts/enterprise/traefik/questions.yaml

@@ -16,25 +16,34 @@ questions:
 
 # Include{containerConfig}
 # Include{podOptions}
-  - variable: ingressClass
-    label: "ingressClass"
-    group: "App Configuration"
+  - variable: expertIngressClass
+    label: Expert Mode
+    group: App Configuration
+    description: |
+      Expert Mode contains settings like: </br>
+      - IngressClass </br>
     schema:
-      additional_attrs: true
-      type: dict
-      attrs:
-        - variable: enabled
-          label: "Enable"
-          description: "When enabled, ingressClass will match the entered name of this app"
+      type: boolean
+      default: false
+      show_subquestions_if: true
+      subquestions:
+        - variable: ingressClass
+          label: "ingressClass"
           schema:
-            type: boolean
-            default: false
-            show_subquestions_if: true
-            subquestions:
+            additional_attrs: true
+            type: dict
+            attrs:
+              - variable: enabled
+                label: "Enable"
+                description: "When enabled, ingressClass will match the entered name of this app"
+                schema:
+                  type: boolean
+                  default: false
               - variable: isDefaultClass
                 label: "isDefaultClass"
                 schema:
                   type: boolean
+                  show_if: [["enabled", "=", true]]
                   default: false
   - variable: logs
     label: "Logs"
@@ -368,7 +377,6 @@ questions:
 # Include{ingressAdvanced}
 # Include{ingressList}
 # Include{securityContextRoot}
-
               - variable: runAsUser
                 label: "runAsUser"
                 description: "The UserID of the user running the application"