mzcompose: Fix various issues

[def-]

• invoke: non-str stdin (e.g. subprocess.DEVNULL) was silently dropped because isinstance against typing.IO is always False
• test_parts: don't let test-analytics failures mask the real test result, and catch cloud_hostname's timeout UIError in create_test_analytics_config so the fallback hostname works
• sql-server: healthcheck's ONLINE guard needs sqlcmd -b to actually fail, without it the check is a plain connectivity probe
• balancerd: fix misspelled --frontegg-resolver-template flag
• run: -d/--detach take no value; -u/--user, --env, --env-from-file, --pull, --cap-add and --cap-drop do
• --sanitizer: keep Enum members as shtab-compatible choices, name strings never match the type-converted member so every value was rejected
• sql: make the postgres-metadata branch reachable, it was shadowed by the materialize/postgres branch and connected to 5432 instead of 26257
• test_result: include stdout in error details (testdrive prints errors to stdout), drop the pre-error output chunk, and fix an off-by-one when the error report starts at position 0
• Materialized/Testdrive/Debezium/SqlLogicTest: stop mutating caller-provided (often shared) parameter dicts and env/entrypoint lists
• remove or honor accepted-but-ignored parameters: Environmentd and Orchestratord resolver templates, Dnsmasq command, TestCerts name, MaterializeEmulator image

Test run: https://buildkite.com/materialize/nightly/builds/17088

[antiguru]

Thank you!