fix: db-pre-config function failing with pg reserved words

When db-pre-config is accidentally set to a pg reserved word
like "true", it fails with a confusing error. The function
names should be properly quoted to avoid such errors. This commit
resolves this by quoting the pre-config function name.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>
(cherry picked from commit a688878236)

test/io/__snapshots__/test_cli/test_schema_cache_snapshot[dbRoutines].yaml

@@ -461,6 +461,23 @@
       pdSchema: public
       pdVolatility: Volatile
 
+- - qiName: 'true'
+    qiSchema: public
+  - - pdDescription: null
+      pdFuncSettings: []
+      pdHasVariadic: false
+      pdName: 'true'
+      pdParams: []
+      pdReturnType:
+        contents:
+          contents:
+            qiName: bool
+            qiSchema: pg_catalog
+          tag: Scalar
+        tag: Single
+      pdSchema: public
+      pdVolatility: Volatile
+
 - - qiName: create_function
     qiSchema: public
   - - pdDescription: null