feat(scale): Add experimental cluster cert questions support (#14055)

**Description**
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Adding experimental support for the cluster certs in the SCALE UI. Ties
in with PR #13852 .
⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [x] ⚙️ 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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Not tested on SCALE.

I just checked the common lib and if I understand correctly it looks for
`certificateIssuer` entry and if empty eventually looks for a
`secretName` entry

**📃 Notes:**
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For now, Common Lib has no knowledge of cluster-wide certificates. Thus:
1. It wouldn't know how to resolve the full secret name from just the
cert name. I.e. it doesn't know what the ClusterIssuer deployment is
called and what the certificate naming scheme is. So, for now, the user
must provide the full secret name in the form of
`<CLUSTERISSUER_APP_NAME>-clusterissuer-<CLUSTER_CERT_NAME>`.
2. It wouldn't be able to enforce cluster-issuer and
Kubernetes-reflector being installed if the user provides a cluster
certificate name

Nevertheless, I think it's fine to have this listed as an experimental
feature since having it in the SCALE GUI makes it much easier to test
the cluster certificates support.


**QUESTION:** Why is the Cert Manager clusterIssuer option variable
named `certificateIssuer` in `IngressTls.yaml` and `clusterIssuer` in
`IngressList.yaml`. I think it should be `certificateIssuer` in both
places.

**✔️ Checklist:**

- [X] ⚖️ My code follows the style guidelines of this project
- [X] 👀 I have performed a self-review of my own code
- [X] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [X] ⚠️ 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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---------

Signed-off-by: sdimovv <36302090+sdimovv@users.noreply.github.com>
Signed-off-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>
Co-authored-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>

templates/questions/ingress/ingressList.yaml

@@ -128,6 +128,13 @@
                               type: int
                               $ref:
                                 - "definitions/certificate"
+                          - variable: clusterCertificate
+                            label:  Cluster Certificate (Experimental)
+                            description: 'Add the name of your cluster-wide certificate, that you set up in the ClusterIssuer chart. NOTE: This is an experimental feature'
+                            schema:
+                              type: string
+                              show_if: [["clusterIssuer", "=", ""]]
+                              default: ""
                           - variable: secretName
                             label: Use Custom Secret (Advanced)
                             schema:

templates/questions/ingress/ingressTLS.yaml

@@ -4,3 +4,16 @@
                       schema:
                         type: string
                         default: ""
+                    - variable: clusterCertificate
+                      label: Cluster Certificate  (Experimental)
+                      description: 'Add the name of your cluster-wide certificate, that you set up in ClusterIssuer chart. NOTE: This is an experimental feature'
+                      schema:
+                        show_if: [["certificateIssuer", "=", ""]]
+                        type: string
+                        default: ""
+                    - variable: secretName
+                      label: Custom Certificate Secret (Advanced)'
+                      schema:
+                        show_if: [["certificateIssuer", "=", ""]]
+                        type: string
+                        default: ""