Fix service connector type registry race conditions

[stefannica]

Describe changes

When multiple concurrent requests are made to the service connector REST API endpoints, they sometimes create a race condition that results in the following error:

│ Error: Error verifying service connector: API request failed with status 501: {"detail":["NotImplementedError","Service connector type gcp is not available locally. Please make sure the corresponding packages and/or ZenML integration are installed and try again."]}

This has been observed while deploying a Terraform GCP stack with the new ZenML Terraform provider against a freshly deployed ZenML server.

The root cause is the initialization of the service connector type registry is not thread safe. This PR uses a re-entrant lock to fix that.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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