Update flaky test reporter to enable libfido2 (#43177)

#43133 removed the
fallback to U2F that this target was relying on to exercise code
that required 2FA. The build tags set in `test-go-flaky` now
include LIBFIDO2_TEST_TAG in a similar manner to other targets
that are passing in CI without issue (`lint-go`, `test-go-unit`).

Makefile

@@ -919,7 +919,7 @@ FLAKY_TOP_N ?= 20
 FLAKY_SUMMARY_FILE ?= /tmp/flaky-report.txt
 test-go-flaky: FLAGS ?= -race -shuffle on
 test-go-flaky: SUBJECT ?= $(shell go list ./... | grep -v -e e2e -e integration -e tool/tsh -e integrations/operator -e integrations/access -e integrations/lib )
-test-go-flaky: GO_BUILD_TAGS ?= $(PAM_TAG) $(FIPS_TAG) $(BPF_TAG) $(TOUCHID_TAG) $(PIV_TEST_TAG)
+test-go-flaky: GO_BUILD_TAGS ?= $(PAM_TAG) $(FIPS_TAG) $(BPF_TAG) $(TOUCHID_TAG) $(PIV_TEST_TAG) $(LIBFIDO2_TEST_TAG)
 test-go-flaky: RENDER_FLAGS ?= -report-by flakiness -summary-file $(FLAKY_SUMMARY_FILE) -top $(FLAKY_TOP_N)
 test-go-flaky: test-go-prepare $(RENDER_TESTS) $(RERUN)
 	$(CGOFLAG) $(RERUN) -n $(FLAKY_RUNS) -t $(FLAKY_TIMEOUT) \