fix(OTEL): reduce high cardinality in traces and metrics (#9286)

# Which Problems Are Solved

There were multiple issues in the OpenTelemetry (OTEL) implementation
and usage for tracing and metrics, which lead to high cardinality and
potential memory leaks:
- wrongly initiated tracing interceptors
- high cardinality in traces:
  - HTTP/1.1 endpoints containing host names
- HTTP/1.1 endpoints containing object IDs like userID (e.g.
`/management/v1/users/2352839823/`)
- high amount of traces from internal processes (spooler)
- high cardinality in metrics endpoint:
  - GRPC entries containing host names
  - notification metrics containing instanceIDs and error messages

# How the Problems Are Solved

- Properly initialize the interceptors once and update them to use the
grpc stats handler (unary interceptors were deprecated).
- Remove host names from HTTP/1.1 span names and use path as default.
- Set / overwrite the uri for spans on the grpc-gateway with the uri
pattern (`/management/v1/users/{user_id}`). This is used for spans in
traces and metric entries.
- Created a new sampler which will only sample spans in the following
cases:
  - remote was already sampled
- remote was not sampled, root span is of kind `Server` and based on
fraction set in the runtime configuration
- This will prevent having a lot of spans from the spooler back ground
jobs if they were not started by a client call querying an object (e.g.
UserByID).
- Filter out host names and alike from OTEL generated metrics (using a
`view`).
- Removed instance and error messages from notification metrics.

# Additional Changes

Fixed the middleware handling for serving Console. Telemetry and
instance selection are only used for the environment.json, but not on
statically served files.

# Additional Context

- closes #8096 
- relates to #9074
- back ports to at least 2.66.x, 2.67.x and 2.68.x

internal/api/grpc/server/server.go

@@ -47,7 +47,6 @@ func CreateServer(
 		grpc.UnaryInterceptor(
 			grpc_middleware.ChainUnaryServer(
 				middleware.CallDurationHandler(),
-				middleware.DefaultTracingServer(),
 				middleware.MetricsHandler(metricTypes, grpc_api.Probes...),
 				middleware.NoCacheInterceptor(),
 				middleware.InstanceInterceptor(queries, externalDomain, system_pb.SystemService_ServiceDesc.ServiceName, healthpb.Health_ServiceDesc.ServiceName),
@@ -63,6 +62,7 @@ func CreateServer(
 				middleware.ActivityInterceptor(),
 			),
 		),
+		grpc.StatsHandler(middleware.DefaultTracingServer()),
 	}
 	if tlsConfig != nil {
 		serverOptions = append(serverOptions, grpc.Creds(credentials.NewTLS(tlsConfig)))