Chore: Refactor OpenTSDB using backend SDK (#35815)

* Refactor OpenTSDB using backend SDK

* Adjust tests to the SDK refactor

* Remove openTSDB from service

* Rename OpenTASDB service to Service, use AuthPassword from DecryptedSecureJson

* Devenv: Add opentsdb v2.3 data source and dashboard

* Letting http client provider to set basic auth,
renaming,
casting datasource direclty to pointer

* Update pkg/tsdb/opentsdb/opentsdb.go

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Update pkg/tsdb/opentsdb/opentsdb.go

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Format struct

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

devenv/datasources.yaml

@@ -84,6 +84,14 @@ datasources:
       tsdbResolution: 1
       tsdbVersion: 1
 
+  - name: gdev-opentsdb-v2.3
+    type: opentsdb
+    access: proxy
+    url: http://localhost:4242
+    jsonData:
+      tsdbResolution: 1
+      tsdbVersion: 3
+
   - name: gdev-elasticsearch-v2-metrics
     type: elasticsearch
     access: proxy