GHA/non-native: improve, migrate x86_64 FreeBSD with tests from Cirrus CI

- run tests via `make test-ci` instead of `make check` with autotools.
- add `x86_64` job for FreeBSD, with tests.
  It matches the existing Cirrus CI job, with these differences:
  - finishes 3x faster (thanks to parallel tests enabled).
  - librtmp is not enabled because it's slated for removal by FreeBSD.
    (already past the removal deadline, thought the package still
    installs.)
  - DICT and TELNET servers fail to start. Couldn't figure out why.
    It means skipping test 1450 and 1452.
  - it runs more tests, e.g. websockets and ip6-localhost.
  - no `pkg update -f`.
  - it misses the `CRYPTOGRAPHY_DONT_BUILD_RUST=1`, `pkg delete curl`,
    `chmod 777`, `sudo -u nobody` and `sysctl net.inet.tcp.blackhole`
    tricks. The latter is the default in these runners, the others did
    not affect results.
- set `-j0` for tests in the NetBSD job. Flaky otherwise.

Closes #14244

tests/CI.md

@@ -107,11 +107,4 @@ admins/group members can be added on request.
 
 ### Cirrus CI
 
-Cirrus CI runs a basic test suite on FreeBSD and Windows. This is configured in
-`.cirrus.yml`.
-
-You can [view the full list of CI jobs on Cirrus CI's
-website](https://cirrus-ci.com/github/curl/curl).
-
-`@bagder` has access to edit the "Project Settings" on that page. Additional
-admins/group members can be added on request.
+Not used anymore.