Fix state of transaction start

This affects the case when compilation config is set on the client,
while a new command is compiled within a transaction. In this case, the
compiler will only use the state issued in the transaction start. Before
this fix, we didn't send state on transaction commands, so those config
was not in effect within transactions, even though each query did carry
the right config.

edgedb/base_client.py

@@ -186,6 +186,10 @@ async def privileged_execute(
                 qc=execute_context.cache.query_cache,
                 output_format=protocol.OutputFormat.NONE,
                 allow_capabilities=enums.Capability.ALL,
+                state=(
+                    execute_context.state.as_dict()
+                    if execute_context.state else None
+                ),
             )
 
     def is_in_transaction(self) -> bool:

tests/test_async_query.py

@@ -1030,3 +1030,18 @@ async def test_dup_link_prop_name(self):
             DROP TYPE test::dup_link_prop_name_p;
             DROP TYPE test::dup_link_prop_name;
         ''')
+
+    async def test_transaction_state(self):
+        with self.assertRaisesRegex(edgedb.QueryError, "cannot assign to id"):
+            async for tx in self.client.transaction():
+                async with tx:
+                    await tx.execute('''
+                        INSERT test::Tmp { id := <uuid>$0, tmp := '' }
+                    ''', uuid.uuid4())
+
+        client = self.client.with_config(allow_user_specified_id=True)
+        async for tx in client.transaction():
+            async with tx:
+                await tx.execute('''
+                    INSERT test::Tmp { id := <uuid>$0, tmp := '' }
+                ''', uuid.uuid4())

tests/test_sync_query.py

@@ -868,3 +868,18 @@ def test_sync_banned_transaction(self):
             r'cannot execute transaction control commands',
         ):
             self.client.execute('start transaction')
+
+    def test_transaction_state(self):
+        with self.assertRaisesRegex(edgedb.QueryError, "cannot assign to id"):
+            for tx in self.client.transaction():
+                with tx:
+                    tx.execute('''
+                        INSERT test::Tmp { id := <uuid>$0, tmp := '' }
+                    ''', uuid.uuid4())
+
+        client = self.client.with_config(allow_user_specified_id=True)
+        for tx in client.transaction():
+            with tx:
+                tx.execute('''
+                    INSERT test::Tmp { id := <uuid>$0, tmp := '' }
+                ''', uuid.uuid4())