Remove file (#23741)

conf/provisioning/datasources/loki_test.yaml

-
-apiVersion: 1
-
-datasources:
-  - name: loki-derived-test
-    type: loki
-    access: proxy
-    url: http://localhost:3100
-    editable: false
-    jsonData:
-      derivedFields:
-        - name: "traceID"
-          matcherRegex: "trace_id=(\\w+)"
-          url: "$${__value.raw}"
-          datasourceUid: jaeger1234
-
-  - name: jaeger-derived-test
-    type: jaeger
-    uid: jaeger1234
-    access: proxy
-    url: http://localhost:16686
-    editable: false
-