fix: support Connect 2026 integration tests

[tdstein]

Fixes #495

Summary:

• Configure the 2026.04–2026.08 Connect images with their available Python runtimes and required integration-test settings.
• Update integration assertions for compatible response fields and ordering changes.
• Ensure package generators are evaluated and temporary content is cleaned up after failures.

Verification:

• Ruff format/check passed.
• Connect 2026.08.1 integration suite: 74 passed.
• Connect 2026.01.0 integration suite: 74 passed.
• Connect 2026.02.0 targeted content compatibility test passed.
• Connect 2026.03.1 verification was blocked by Docker Desktop returning a read-only filesystem error while provisioning the image.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
2509	2359	94%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: a766118 by action🐍