Send actor worker assignment in task events (#394)(#393)

This change adds a new `FastTaskAssignment` message type to fast task protos, which is used to send actor assignment info to admin via task events.

While here I also hardened linting on our protos and updates existing protos to conform. This matches the restrictions we have in place in unionai/cloud/idl

- [x] Add and run unittests
- [x] Run locally and verify worker assignment info comes through in task events

```
❯ curl -s http://localhost:8088/api/v1/task_executions/flytesnacks/development/f0dcb5e7cae6d47acaf3/n0\?limit\=100 | jq '.taskExecutions[0].closure.metadata.externalResources'
[
  {
    "externalId": "",
    "index": 0,
    "retryAttempt": 0,
    "phase": "UNDEFINED",
    "cacheStatus": "CACHE_DISABLED",
    "logs": [],
    "customInfo": {
      "assignedWorker": "example-2b377271ee80",
      "environmentId": "flytesnacks_development_example_c183cb6c9868d96"
    }
  }
]

❯ curl -s http://localhost:8088/api/v1/task_executions/flytesnacks/development/f0dcb5e7cae6d47acaf3/n1\?limit\=100 | jq '.taskExecutions[0].closure.metadata.externalResources'
[
  {
    "externalId": "",
    "index": 0,
    "retryAttempt": 0,
    "phase": "UNDEFINED",
    "cacheStatus": "CACHE_DISABLED",
    "logs": [],
    "customInfo": {
      "assignedWorker": "example-2b377271ee80",
      "environmentId": "flytesnacks_development_example_c183cb6c9868d96"
    }
  }
]
```

One merged, bring to cloud. Will be a no-op initially, but we can use this in a few dependent tasks to surface logs or look up other fast task worker info.

Should this change be upstreamed to OSS (flyteorg/flyte)? If not, please uncheck this box, which is used for auditing. Note, it is the responsibility of each developer to actually upstream their changes. See [this guide](https://unionai.atlassian.net/wiki/spaces/ENG/pages/447610883/Flyte+-+Union+Cloud+Development+Runbook/#When-are-versions-updated%3F).
- [ ] To be upstreamed to OSS

ref COR-1581

Add custom info field to ExternalResourceInfo
Adds a custom info field to `ExternalResourceInfo`. This is an extension of the [ExternalId](https://github.com/unionai/flyte/blob/2b6dfcaedab7ed6a7606d1434211086d064c6560/flyteidl/protos/flyteidl/event/event.proto#L269) field and can be used to pass plugin specific context or identifiers. We will use this to pass fast task worker assignment.

N/A

Just merge, not used yet

Should this change be upstreamed to OSS (flyteorg/flyte)? If not, please uncheck this box, which is used for auditing. Note, it is the responsibility of each developer to actually upstream their changes. See [this guide](https://unionai.atlassian.net/wiki/spaces/ENG/pages/447610883/Flyte+-+Union+Cloud+Development+Runbook/#When-are-versions-updated%3F).
- [x] To be upstreamed to OSS

ref COR-1581

Closes #393

Signed-off-by: Daniel Rammer <[email protected]>

flyteadmin/pkg/repositories/transformers/task_execution.go

@@ -11,6 +11,7 @@ import (
 	_struct "github.com/golang/protobuf/ptypes/struct"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/types/known/structpb"
 
 	"github.com/flyteorg/flyte/flyteadmin/pkg/common"
 	"github.com/flyteorg/flyte/flyteadmin/pkg/errors"
@@ -310,6 +311,11 @@ func mergeExternalResource(existing, latest *event.ExternalResourceInfo) *event.
 	}
 	existing.Logs = mergeLogs(existing.GetLogs(), latest.GetLogs())
 
+	// Overwrite custom info if provided
+	if latest.GetCustomInfo() != nil {
+		existing.CustomInfo = proto.Clone(latest.GetCustomInfo()).(*structpb.Struct)
+	}
+
 	return existing
 }