feat(common): enable middlewares when referenced on ingress and add chart+common middlewares (#31535)

**Description**

Currently users have to enable the ingressMiddleware AND reference said
middleware under their ingress.
This adds additional work and is confusion when, for example, we include
our own middleware.

This PR checks if a disabled middleware, is referenced anywhere on an
enabled ingress with traefik-integration enabled.
It does so by excluding any external middlewares (with namespace
explicitly defined)

If it finds any that are not enabled, it will still enable/create them
regardless.

This PR also increases the places ingress-middleware can be referenced
on the ingress:

1. common-middlewares (.Values.global.traefik.commonMiddlewares)
Special bare-bones middlewares that are applied to all ingresses by
default, unless very explicitly overridden

2. chart-middlewares
($ingress.integrations.traefik.chartMiddlewares)
Special middlewares that are defined by the chart creator and should
always be loaded regardless of user middlewares, for example: nextcloud

3. user-middlewares
what we had already

**⚙️ 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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**📃 Notes:**
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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
- [ ] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):` or `chore(chart-name):`

**➕ App addition**

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

- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
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---------

Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>
Co-authored-by: Stavros Kois <s.kois@outlook.com>
Co-authored-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

website/src/content/docs/common/global.md

@@ -217,6 +217,29 @@ global:
 
 ---
 
+### `traefik.commonMiddlewares`
+
+Define middlewares that will be applied to all ingresses
+
+|            |                                     |
+| ---------- | ----------------------------------- |
+| Key        | `global.traefik.commonMiddlewares`  |
+| Type       | `list`                              |
+| Required   | ❌                                   |
+| Helm `tpl` | ❌                                   |
+| Default    | `[{name: tc-basic-secure-headers}]` |
+
+Example
+
+```yaml
+global:
+  traefik:
+    commonMiddlewares:
+      - name: tc-basic-secure-headers
+```
+
+---
+
 ## Full Examples
 
 ```yaml
@@ -232,4 +255,6 @@ global:
     addServiceAnnotations: true
   traefik:
     addServiceAnnotations: true
+    commonMiddlewares:
+      - name: tc-basic-secure-headers
 ```

website/src/content/docs/common/ingress/traefik.md

@@ -201,6 +201,32 @@ ingress:
 
 ---
 
+## `chartMiddlewares`
+
+Same as [middlewares](#middlewares) but meant to be used by the chart developer
+to define some custom middleware specific to this ingress.
+
+|            |                                                       |
+| ---------- | ----------------------------------------------------- |
+| Key        | `ingress.$name.integrations.traefik.chartMiddlewares` |
+| Type       | `list` of `map`                                       |
+| Required   | ❌                                                     |
+| Helm `tpl` | ❌                                                     |
+| Default    | `[]`                                                  |
+
+Example
+
+```yaml
+ingress:
+  ingress-name:
+    integrations:
+      traefik:
+        chartMiddlewares:
+          - name: my-middleware
+```
+
+---
+
 ## Full Examples
 
 ```yaml
@@ -216,4 +242,6 @@ ingress:
           - name: my-middleware
             namespace: ""
             expandObjectName: false
+        chartMiddlewares:
+          - name: my-middleware
 ```