Fix deleting default connections

[kmcginnes]

Description

There is an issue that seems to occur in a specific scenario:

1. Open Graph Explorer for the first time
2. Default connections created
3. Delete default connection

It should delete the connection, but instead it immediately recreates the deleted connection. Further deletions work correctly.

To fix, I rearranged the logic in the AppStatusLoader effect.

• Update default connection query to generate one connection per query engine, unless a specific query engine is specified
• Check if any connections exist, if so skip default connection logic
• Check if any default connections were received from the server, if not skip
• Add all default connections to the connections storage
• Set first connection as active
• Reorder the query engine options to put the property graph options together and RDF last

Validation

• Tested locally by creating a defaultConnection.json and deleting my local Graph Explorer database to simulate a first run

Related Issues

• Part of Prep release v1.14.1 #817
• Part of Allow editing connections generated from default connection #800

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[andreachild]

LGTM