Devenv: Remove old-versioned loki blocks and update prometheus2 block (#31282)

* Remove very old-versioned loki blocks

* Update prometheus block from 2.7.2 to latest

* Remove data sources in Grafana

* Fix e2e test not to intercept the whole url

Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

devenv/datasources_docker.yaml

@@ -227,20 +227,6 @@ datasources:
       authType: credentials
       defaultRegion: eu-west-2
 
-  # Keep to test old /api/prom API
-  - name: gdev-loki-0.3
-    type: loki
-    access: proxy
-    url: http://loki0.3:3100
-    editable: false
-
-  # First version with new v1 API (remove once v1 is out)
-  - name: gdev-loki-0.4
-    type: loki
-    access: proxy
-    url: http://loki0.4:3100
-    editable: false
-
   - name: gdev-loki
     type: loki
     access: proxy