fix: Return a more helpful error message for no matching sharding rule

Fixes #2127.

src/influxdb_ioxd/rpc/error.rs

@@ -38,7 +38,8 @@ pub fn default_server_error_handler(error: server::Error) -> tonic::Status {
             description: "hard buffer limit reached".to_string(),
         }
         .into(),
-        source @ Error::WritingOnlyAllowedThroughWriteBuffer { .. } => tonic::Status::failed_precondition(source.to_string()),
+        source @ Error::WritingOnlyAllowedThroughWriteBuffer { .. } |
+            source @ Error::LineConversion { .. } => tonic::Status::failed_precondition(source.to_string()),
         Error::NoRemoteConfigured { node_group } => NotFound {
             resource_type: "remote".to_string(),
             resource_name: format!("{:?}", node_group),

tests/end_to_end_cases/write_api.rs

@@ -498,7 +498,9 @@ async fn test_write_dev_null() {
 
     assert_eq!(
         err.to_string(),
-        "Unexpected server error: Internal error: Internal Error"
+        "Unexpected server error: The system is not in a state required for the operation's \
+         execution: error converting line protocol to flatbuffers: Error getting shard id No \
+         sharding rule matches line: mem bar=1 1"
     );
 }