[COLLAB-CON-4]: (frontend) delete flow connection

[kevinkim-ogp]

TL;DR

• Adds the ability to delete shared connections from a flow in the UI.
• Checks if the shared connection existed in flow_connections and was deleted, and restores it rather than attempt to create a new entry

How to test?

• Cannot delete flow connection when Pipe is published

Delete a flow connection

• Removed from UI
• Removed from Step(s) that use the flow connection

Screenshots

[kevinkim-ogp]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [COLLAB-CON-4]: (frontend) delete flow connection #1340 👈 (View in Graphite)
• [COLLAB-CON-3]: deleteFlowConnection mutation #1339
• [COLLAB-CON-2]: (frontend) view shared connections #1338
• [COLLAB-CON-1]: getFlowConnections query #1337
• develop-v2

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