use grafana cloud (#1518)

## Description:

Self hosted grafana has maintenance burden, so migrate to grafana cloud 

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA aggreement (only required once).

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

tests/util/TestServerConfig.ts

@@ -43,10 +43,7 @@ export class TestServerConfig implements ServerConfig {
   otelEndpoint(): string {
     throw new Error("Method not implemented.");
   }
-  otelUsername(): string {
-    throw new Error("Method not implemented.");
-  }
-  otelPassword(): string {
+  otelAuthHeader(): string {
     throw new Error("Method not implemented.");
   }
   turnIntervalMs(): number {