Add support for pgjwt test (#10611)

## Problem
We don't currently test pgjwt, while it is based on pg_prove and can be
easily added
## Summary of changes
The test for pgjwt was added.

docker-compose/ext-src/pgjwt-src/neon-test.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -ex
+cd "$(dirname "${0}")"
+pg_prove test.sql

docker-compose/ext-src/pgjwt-src/test-upgrade.patch

@@ -0,0 +1,15 @@
+diff --git a/test.sql b/test.sql
+index d7a0ca8..f15bc76 100644
+--- a/test.sql
++++ b/test.sql
+@@ -9,9 +9,7 @@
+ \set ON_ERROR_STOP true
+ \set QUIET 1
+ 
+-CREATE EXTENSION pgcrypto;
+-CREATE EXTENSION pgtap;
+-CREATE EXTENSION pgjwt;
++CREATE EXTENSION IF NOT EXISTS pgtap;
+ 
+ BEGIN;
+ SELECT plan(23);

docker-compose/ext-src/pgjwt-src/test-upgrade.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -ex
+cd "$(dirname ${0})"
+patch -p1 <test-upgrade.patch
+pg_prove test.sql