After a node's query is updated, we should revalidate dimension links

[shangyian]

Summary

When any node with a query is updated, we should revalidate the node's dimension links, as some of them may have become invalidated due to the updated query. For example, if a transform's query gets updated to remove a column that has a dimension link defined on it, we should also remove the dimension link.

To fix it for existing nodes, I've added some changes to the POST /nodes/{node}/validate endpoint so that it does the same logic of cleaning up unneeded dimension links.

Test Plan

• [x] PR has an associated issue: #1034
• [x] make check passes
• [x] make test shows 100% unit test coverage

Deployment Plan

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