api --field silently ignored on GET requests

[tiulpin]

CLI Version: dev
TeamCity Server Version: 2026.2
Operating System: macOS

What happened?

tc api '/app/rest/server' -f 'key=value' silently ignores the --field flag on GET requests. The flag builds a JSON request body, which is meaningless for GET.

$ tc api '/app/rest/server' -f 'key=value'
{  ... normal server response ... }

Expected behavior

Should warn or error when --field is used with GET (the default method), e.g.:
Warning: --field is ignored for GET requests. Use -X POST to send a request body.

Steps to reproduce

1. Run tc api '/app/rest/server' -f 'key=value'
2. Observe no warning — the field is silently discarded