refactor: rename renameMap to schemaRenameMap for clarity

[pyramation]

Summary

Renames renameMap to schemaRenameMap throughout the schema rename test to make it explicit that this map is specifically for schema renaming. This prepares for future extensibility where other rename maps (for tables, functions, triggers, etc.) may be added.

Changes:

• RenameMap interface → SchemaRenameMap
• renameMap variable → schemaRenameMap in all function parameters and usages
• renameMapSummary → schemaRenameMapSummary
• Updated snapshot names from rename-map to schema-rename-map

Review & Testing Checklist for Human

• Verify no renameMap references were missed (search for renameMap in the test file)
• Confirm snapshot file keys match the updated test description

Test plan: Run pnpm test in packages/plpgsql-deparser - all 58 tests and 28 snapshots should pass.

Notes

• Link to Devin run: https://app.devin.ai/sessions/8e1c971e9b194cd9a7dda034c89bd74b
• Requested by: @pyramation

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