Add --plain/--no-header to all list commands

[tiulpin]

Area: Other / Not sure

Problem or use case

--plain and --no-header are only available on run list. Other list commands (job list, agent list, project list, queue list, pool list) require --json + jq for scripting, which is heavier.

Proposed solution

Add --plain (tab-separated output) and --no-header to all list commands for consistency:

# Works today
tc run list --plain --no-header | awk '{print $2}'

# Should also work
tc job list --plain --no-header | awk '{print $1}'
tc agent list --plain --no-header | awk '{print $1}'
tc queue list --plain --no-header | awk '{print $1}'
tc project list --plain --no-header | awk '{print $1}'
tc pool list --plain --no-header | awk '{print $1}'

Alternatives considered

Using --json + jq works but is verbose for simple field extraction in shell scripts.