(apigatewayv2): grant permissions for sending messages to a WebSocket #14828

[douglasnaphas]

Issue aws#14828 in the base repo.

[douglasnaphas]

TODO

• See what the integration test runner[s] do[es]. Does it clean up? When does it compare the template to the .expected file, and when does it instantiate resources?
• Figure out how to run just one integration test on apigatewayv2.
• Does the integration test itself clean up after itself?
• Add a minimal integration test to apigatewayv2, and run it.
• Make my integration test clean up after itself.
• Make my integration test grant permissions for sending messages to a WebSocket using the workaround, and test that this works.
• What's the difference between ManageConnections and Invoke, anyway? When do you need each?

[github-actions]

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