Change the Splunk URL for logging (powerhome#3665)

**What does this PR do?** A clear and concise description with your
runway ticket url.
Copy the new URL from the original idea in Tempo [PR
powerhome#3691](powerhome/tempo#3691)

**Screenshots:** Screenshots to visualize your addition/change


**How to test?** Steps to confirm the desired behavior:
1. Go to a Milano environment
2. Click on "More" in the top right, and then "logs"
3. Logs won't appear because the URL needs to change


#### Checklist:
- [ ] **LABELS** Add a label: `enhancement`, `bug`, `improvement`, `new
kit`, `deprecated`, or `breaking`. See [Changelog &
Labels](https://github.com/powerhome/playbook/wiki/Changelog-&-Labels)
for details.
- [ ] **DEPLOY** I have added the `milano` label to show I'm ready for a
review.
- [ ] **TESTS** I have added test coverage to my code.

milano.production.yml

@@ -13,7 +13,7 @@ rollback:
   <<: *deploy
 
 links:
-  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22&earliest=-15m&latest=now"
+  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22%20index%3D%22app-prod-*%22&earliest=-15m&latest=now"
   metrics_hq: "https://metrics.powerapp.cloud/d/s9c8D_K7k/pod-resource-usage?orgId=1&refresh=1m&var-datasource=prometheus-app-prod-hq&var-namespace=playbook-production&var-filter=.*&var-pod=All"
   metrics_gotham: "https://metrics.powerapp.cloud/d/s9c8D_K7k/pod-resource-usage?orgId=1&var-datasource=prometheus-app-prod-gm&var-namespace=playbook-production&var-filter=.*&var-pod=All&refresh=1m"
 

milano.staging.yml

@@ -13,7 +13,7 @@ rollback:
   <<: *deploy
 
 links:
-  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22&earliest=-15m&latest=now"
+  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22%20index%3D%22app-beta-*%22&earliest=-15m&latest=now"
   metrics: "https://metrics.powerapp.cloud/d/s9c8D_K7k/pod-resource-usage?orgId=1&refresh=10s&var-datasource=prometheus-app-beta-hq&var-namespace=$ENVIRONMENT&var-filter=.%2B&var-pod=All"
 
 ci:

milano.yml

@@ -13,7 +13,7 @@ rollback:
   <<: *deploy
 
 links:
-  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22&earliest=-15m&latest=now"
+  logs: "https://splunk.powerapp.cloud/en-US/app/search/search?q=search%20k8s.namespace.name%3D%22$GITHUB_REPO_NAME-$ENVIRONMENT%22%20index%3D%22$CLUSTER%22&earliest=-15m&latest=now"
   metrics: "https://metrics.powerapp.cloud/d/s9c8D_K7k/pod-resource-usage?orgId=1&refresh=10s&var-datasource=prometheus-$CLUSTER&var-namespace=playbook-$ENVIRONMENT&var-filter=.%2B&var-pod=All"
 
 ci: