nix(test): add test suite for observability tests

- Create separate test suite for observability tests

- Create wrapper script `postgrest-test-observability`

- Add to CI and `postgrest-check`

- Move JWT cache tests under observability tests

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

test/observability/fixtures/database.sql

@@ -0,0 +1,2 @@
+-- Suppress NOTICE: ... messages
+SET client_min_messages TO warning;

test/observability/fixtures/load.sql

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+-- Loads all fixtures for the PostgREST observability tests
+
+\set ON_ERROR_STOP on
+
+\ir database.sql
+\ir roles.sql
+\ir schema.sql
+\ir privileges.sql

test/observability/fixtures/privileges.sql

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+-- Schema test objects
+SET search_path = test, pg_catalog;
+
+GRANT USAGE ON SCHEMA test TO postgrest_test_anonymous;
+GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA test TO postgrest_test_anonymous;
+REVOKE ALL PRIVILEGES ON TABLE authors_only FROM postgrest_test_anonymous;
+
+GRANT USAGE ON SCHEMA test TO postgrest_test_author;
+GRANT ALL ON TABLE authors_only TO postgrest_test_author;

test/observability/fixtures/roles.sql

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+DROP ROLE IF EXISTS postgrest_test_anonymous, postgrest_test_author;
+CREATE ROLE postgrest_test_anonymous;
+CREATE ROLE postgrest_test_author;
+
+GRANT postgrest_test_anonymous, postgrest_test_author TO :PGUSER;

test/observability/fixtures/schema.sql

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+DROP SCHEMA IF EXISTS test;
+
+CREATE SCHEMA test;
+
+SET search_path = test, pg_catalog;
+
+--
+-- Name: authors_only; Type: TABLE; Schema: test; Owner: -
+--
+
+CREATE TABLE authors_only (
+    owner character varying NOT NULL,
+    secret character varying NOT NULL
+);
+
+--
+-- Name: authors_only_pkey; Type: CONSTRAINT; Schema: test; Owner: -
+--
+
+ALTER TABLE ONLY authors_only
+    ADD CONSTRAINT authors_only_pkey PRIMARY KEY (secret);