server/tests-py: Remove test_horizontal_scale.py.

This removes *test_horizontal_scale.py*, which tests horizontal scaling by running some tests against two HGE servers, both talking to PgBouncer.

This doesn't really test HGE; it's testing whether PgBouncer guarantees the same level of consistency as PostgreSQL. I'm not convinced that it's worthwhile, so I am deleting it.

[NDAT-542]: https://hasurahq.atlassian.net/browse/NDAT-542?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/8821
GitOrigin-RevId: 2029f2fea11c7fd58ed47e724cb3cd50e67d5a43

.circleci/server-test-names.txt

@@ -54,5 +54,5 @@
 # apollo-federation
 # allowlist-queries
 # jwk-url
-horizontal-scaling
+# horizontal-scaling
 # developer-api-tests

server/tests-py/test_horizontal_scale.py

@@ -1,63 +0,0 @@
-import pytest
-import time
-import json
-import jsondiff
-from context import PytestConf
-from ruamel.yaml import YAML
-
-yaml=YAML(typ='safe', pure=True)
-
-
-if not PytestConf.config.getoption("--test-hge-scale-url"):
-    pytest.skip("--test-hge-scale-url flag is missing, skipping tests", allow_module_level=True)
-
-
-class TestHorizontalScaleBasic():
-    servers = {}
-
-    @pytest.fixture(autouse=True, scope='class')
-    def transact(self, hge_ctx):
-        self.servers['1'] = hge_ctx.hge_url
-        self.servers['2'] = hge_ctx.hge_scale_url
-        yield
-        # teardown
-        hge_ctx.v1q_f(self.dir() + '/teardown.yaml')
-
-    def test_horizontal_scale_basic(self, hge_ctx):
-        with open(self.dir() + "/steps.yaml") as c:
-            conf = yaml.load(c)
-
-        assert isinstance(conf, list) == True, 'Not a list'
-        for _, step in enumerate(conf):
-            # execute operation
-            response = hge_ctx.http.post(
-                self.servers[step['operation']['server']] + "/v1/query",
-                json=step['operation']['query']
-            )
-            resp = response.json()
-            assert \
-                response.status_code == 200, \
-                f'Expected {response.status_code} to be 200. Response:\n{json.dumps(resp, indent=2)}'
-
-            # wait for 20 sec
-            time.sleep(20)
-            # validate data
-            response = hge_ctx.http.post(
-                self.servers[step['validate']['server']] + "/v1alpha1/graphql",
-                json=step['validate']['query']
-            )
-            resp = response.json()
-            assert \
-                response.status_code == 200, \
-                f'Expected {response.status_code} to be 200. Response:\n{json.dumps(resp, indent=2)}'
-
-            if 'response' in step['validate']:
-                assert resp == step['validate']['response'], yaml.dump({
-                    'response': resp,
-                    'expected': step['validate']['response'],
-                    'diff': jsondiff.diff(step['validate']['response'], resp)
-                })
-
-    @classmethod
-    def dir(cls):
-        return 'queries/horizontal_scale/basic'