[Task]: Investigate Failures in Go Flink Load Tests with original load

### What needs to happen?

We need to investigate why the following Go Flink Load Test workflows fail when running with the original load:
- LoadTests Go GBK Flink Batch
- LoadTests Go Combine Flink Batch
- LoadTests Go SideInput Flink Batch
- LoadTests Go CoGBK Flink Batch

A quick fix was applied to reduce the load, which allowed the workflows to run successfully. However, we should determine the root cause of the failures under the original load conditions.

#### Example of Original Load for CoGBK:
`--input_options=''{\"num_records\":20000000,\"key_size\":10,\"value_size\":90,\"num_hot_keys\":5,\"hot_key_fraction\":1}''
--co_input_options=''{\"num_records\":2000000,\"key_size\":10,\"value_size\":90,\"num_hot_keys\":1000,\"hot_key_fraction\":1}''
`

### Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

### Issue Components

- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [x] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [x] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner