Remove mergedConfigurationSelector and legacy schema-style coupling

[kmcginnes]

Description

Once all consumers have been migrated (#1726, #1727, #1728), the legacy merge system can be deleted.

Preferred Solution

• Delete mergedConfigurationSelector and mergeConfiguration()
• Delete RawConfiguration.schema (the config-provided schema is defunct)
• Remove the & VertexPreferencesStorageModel intersection from VertexTypeConfig
• Remove the & EdgePreferencesStorageModel intersection from EdgeTypeConfig
• Delete any helper functions that only existed to support the 3-way merge (e.g., patchToRemoveDisplayLabel)
• Update or remove tests that test the old merge behavior

Related Issues

• Part of Support graphs with very large numbers of node types (70k+) #1677
• Depends on Migrate all Cytoscape visual properties to ele.data() mappers #1726
• Depends on Migrate styling UI panels to styled type atoms #1727
• Depends on Migrate remaining schema consumers to useGraphSchema and styled atoms #1728

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