test: remove tests/fmf directory

The client E2E and retry-loop tests have been superseded by the
native, container, and RPM test suites using the shared utils
infrastructure. Remove the standalone scripts and FMF metadata.

Signed-off-by: Miguel Martín <mmartinv@redhat.com>
Assisted-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mmartinv

tests/bootc/test-bootc-onboarding.sh

@@ -216,7 +216,7 @@ esac
 log_info "Building go-fdo-client rpm packages"
 pushd ../../.. && \
 make rpm
-sudo cp rpmbuild/rpms/"$(uname -m)"/*.rpm tests/fmf/tests && popd
+popd
 
 # Building bootc container with go-fdo-client installed
 log_info "Building bootc container with go-fdo-client installed"