fix(grafana): Reduce default Grafana k8s-sidecar resources (#46287)

**Description**

The default Grafana chart requests and limits for the `k8s-sidecar`
containers are a bit over the top:

```bash
kubectl resource-capacity --namespace grafana --pods -uc 
NODE            POD                       CONTAINER             CPU REQUESTS   CPU LIMITS     CPU UTIL   MEMORY REQUESTS   MEMORY LIMITS   MEMORY UTIL

...                                                                                                                                         
k8s-control-1   grafana-9554bbdd8-ph6vq   grafana-alerts        75m (0%)       1500m (10%)    2m (0%)    200Mi (0%)        2400Mi (2%)     272Mi (0%)
k8s-control-1   grafana-9554bbdd8-ph6vq   grafana-dashboards    75m (0%)       1500m (10%)    1m (0%)    200Mi (0%)        2400Mi (2%)     275Mi (0%)
k8s-control-1   grafana-9554bbdd8-ph6vq   grafana-datasources   75m (0%)       1500m (10%)    1m (0%)    200Mi (0%)        2400Mi (2%)     272Mi (0%)
k8s-control-1   grafana-9554bbdd8-ph6vq   grafana-notifiers     75m (0%)       1500m (10%)    1m (0%)    200Mi (0%)        2400Mi (2%)     272Mi (0%)
k8s-control-1   grafana-9554bbdd8-ph6vq   grafana-plugins       75m (0%)       1500m (10%)    1m (0%)    200Mi (0%)        2400Mi (2%)     272Mi (0%)
...
```

I have never seen them use more than 10m CPU or go over 300Mi of memory.

So I think it makes sense to assign lower default resources than what
the `common` defaults are.

⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

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

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

- [X] ⚖️ My code follows the style guidelines of this project
- [X] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made changes to the documentation
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning
- [X] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):`, `chore(chart-name):`, `docs(chart-name):` or
`fix(docs):`

**➕ 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`

---

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charts/stable/grafana/Chart.yaml

@@ -39,5 +39,4 @@ sources:
   - https://grafana.com/
   - https://hub.docker.com/r/grafana/grafana
 type: application
-version: 22.0.0
-
+version: 22.0.1

charts/stable/grafana/values.yaml

@@ -211,6 +211,13 @@ workload:
               enabled: false
             startup:
               enabled: false
+          resources:
+            requests:
+              cpu: 10m
+              memory: 128Mi
+            limits:
+              cpu: 200m
+              memory: 1536Mi
         datasources:
           enabled: true
           imageSelector: sidecarImage
@@ -241,6 +248,13 @@ workload:
               enabled: false
             startup:
               enabled: false
+          resources:
+            requests:
+              cpu: 10m
+              memory: 128Mi
+            limits:
+              cpu: 200m
+              memory: 1536Mi
         alerts:
           enabled: true
           imageSelector: sidecarImage
@@ -271,6 +285,13 @@ workload:
               enabled: false
             startup:
               enabled: false
+          resources:
+            requests:
+              cpu: 10m
+              memory: 128Mi
+            limits:
+              cpu: 200m
+              memory: 1536Mi
         plugins:
           enabled: true
           imageSelector: sidecarImage
@@ -301,6 +322,13 @@ workload:
               enabled: false
             startup:
               enabled: false
+          resources:
+            requests:
+              cpu: 10m
+              memory: 128Mi
+            limits:
+              cpu: 200m
+              memory: 1536Mi
         notifiers:
           enabled: true
           imageSelector: sidecarImage
@@ -331,6 +359,13 @@ workload:
               enabled: false
             startup:
               enabled: false
+          resources:
+            requests:
+              cpu: 10m
+              memory: 128Mi
+            limits:
+              cpu: 200m
+              memory: 1536Mi
 
 configmap:
   dashboard-provider: