Fix test harness - update docker images

[kantselovich]

Fixes #33

Summary

• fix the Presto Docker image build
• remove Vertica from the default CI/local test stack
• fix DuckDB schema introspection for catalog-qualified paths

Details

This PR takes the practical path to get CI green again.

Vertica is still supported in code, but the repo no longer provisions it by default in CI or docker-compose. Vertica-backed tests now run only when DATADIFF_VERTICA_URI is explicitly provided.

DuckDB also needed follow-up fixes:

• render TIMESTAMP WITH TIME ZONE correctly
• query information_schema.columns directly and filter by table_catalog for 3-part paths
• update the corresponding unit test expectation

The Presto development image was also updated to use a current JDK base image and python-is-python3.

Testing

• targeted DuckDB unit tests pass locally
• CI running on the cleaned branch history

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Failed	Vulnerabilities	2   0   0   0	View in Orca

☢️ The following Vulnerabilities (CVEs) have been detected

	PACKAGE	FILE	CVE ID	INSTALLED VERSION	FIXED VERSION
	deepdiff	./poetry.lock	CVE-2025-58367	7.0.1	8.6.1	View in code
	cryptography	./poetry.lock	CVE-2024-12797	43.0.3	44.0.1	View in code

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca