Erroneous Go race detection

Describe the bug

Currently, running parallel tests using this package with race detection on causes false positives of data races:

WARNING: DATA RACE
Read at 0x000005260ee8 by goroutine 11:
github.com/microsoftgraph/msgraph-sdk-go-core.getInstance()
/home/runner/go/pkg/mod/github.com/microsoftgraph/msgraph-sdk-go-core@v1.3.2/error_mappings_registry.go:19 +0x30
github.com/microsoftgraph/msgraph-sdk-go-core.GetErrorFactoryFromRegistry()
/home/runner/go/pkg/mod/github.com/microsoftgraph/msgraph-sdk-go-core@v1.3.2/error_mappings_registry.go:55 +0x2b

...

Previous write at 0x000005260ee8 by goroutine 34:
github.com/microsoftgraph/msgraph-sdk-go-core.getInstance()
/home/runner/go/pkg/mod/github.com/microsoftgraph/msgraph-sdk-go-core@v1.3.2/error_mappings_registry.go:23 +0x12f
github.com/microsoftgraph/msgraph-sdk-go-core.GetErrorFactoryFromRegistry()
/home/runner/go/pkg/mod/github.com/microsoftgraph/msgraph-sdk-go-core@v1.3.2/error_mappings_registry.go:55 +0x2b

The issue seems to be in:
https://github.com/microsoftgraph/msgraph-sdk-go-core/blob/a8bcb6c81e33e77c3d5338337e5da8b8085cd932/error_mappings_registry.go#L19
The optimistic nil check triggers a read-write race detection - perhaps it can be disabled when go test -race is on?

Expected behavior

Go's race detection won't fail tests when using the package in it

How to reproduce

Run tests using the package in parallel with -race specified in go test's arguments.

SDK Version

No response

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

Start with error_mappings_registry.go around lines 19 and 55, then reproduce the issue by running parallel tests with go test -race. Trace the reported read and write and verify that the package's race-enabled tests complete without false-positive race failures.