Add TEST_SCHEMA: install location as a whole-suite test dimension

[jnasbyupgrade]

Summary

• extension_drop's control file has no schema= line, so it's genuinely install-schema-flexible — nothing in its own SQL may assume where it landed.
• test/sql/schema.sql already proves the stricter off-search_path/quoting property on its own, but only for whatever it happens to exercise. This adds a TEST_SCHEMA switch (mirroring TEST_LOAD_SOURCE's existing GUC-propagation mechanism) so the whole suite runs against an explicitly-chosen schema too, catching schema-hardcoding bugs elsewhere that a single dedicated test wouldn't necessarily reach. Complements, not replaces, schema.sql.
• test/install/load.sql targets TEST_SCHEMA with CREATE EXTENSION ... SCHEMA, never by mutating search_path first (which would mask exactly the bug this exists to catch).
• test/deps.sql adds the target schema to search_path for convenience, so the rest of the suite's unqualified calls to extension_drop's own functions keep working unchanged.
• Not a CI matrix dimension — a schema name is an input value the same assertions run against in the same environment, not a real isolation boundary. make test-schema-all runs both legs (empty, and a quoting-required name that's both mixed-case AND contains a space) locally.

Reference implementation: Postgres-Extensions/pg_count_nulls#28.

Test plan

• make test (default, empty TEST_SCHEMA) passes
• make test TEST_SCHEMA="Test Schema" passes, and verified directly against pg_extension/pg_namespace that extension_drop actually landed in "Test Schema"
• make test-schema-all (both legs) passes
• make lint clean
• Confirmed make test-update TEST_UPDATE_FROM=0.1.1 fails identically with and without this change (pre-existing, documented limitation — no real second released version yet)

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