Persist field to support shared namespace in agent configuration

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What does this MR do and why?

Stores the provided shared_namespace in the agent configuration when it is provided and also saves in the database. If the value is not provided, it is not set.

References

#519256 (closed)

Screenshots or screen recordings

N/A - it's a back-end update to persist in the database.

How to set up and validate locally

1. Update the agent configuration to not explicitly specify the shared_namespace and verify the record in the database and has the shared_namespace value as ''.

   remote_development:
     enabled: true
     dns_zone: workspaces.cocreate.test

2. Update the agent configuration to explicitly specify the shared_namespace and verify the record in the database and has the shared_namespace value correctly set.

   remote_development:
     enabled: true
     dns_zone: workspaces.cocreate.test
     shared_namespace: "test"

MR acceptance checklist

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