test: extend skip triage to the remaining ~100 unclassified sites

#623 triaged eight files (53 sites). Roughly 100 bare pytest.skip() calls remain across src/vip_tests, each still carrying the ambiguous default. Work file by file, adding each to TRIAGED_FILES in selftests/test_skip_triage.py as it is finished, so the guard grows with the coverage.

Highest value first: workbench/test_publish_to_connect.py (12), workbench/test_git_ops.py (10), package_manager/test_binary_packages.py (8), security/test_https.py (4). The security suite deserves care — a check that silently did not run is worse there than anywhere else.

Also settle the three deferred in #623, all previously decided in #268: URL is not HTTPS, tls.insecure=true, No R versions available on Connect. Each is arguably a check that did not happen rather than one that did not apply.

Start in selftests/test_skip_triage.py and inspect the remaining bare pytest.skip() calls under src/vip_tests. Work through the named test files first, adding completed files to TRIAGED_FILES, and resolve the three deferred cases using the decisions recorded in #268. Done means the remaining skips have been classified and the guard covers each finished file.