fix: Add known conformance test failures (googleapis#2474)

* Add known conformance test failures * Fix formatting * Typo * working dir should be root (I think) * Now the path should be right * cat file * last typo? * =( * change format * Just use regex and cat

Author: andre-sampaio

.kokoro/conformance.sh

@@ -67,9 +67,7 @@ do
 
  pushd .
  cd cloud-bigtable-clients-test/tests
- # If there is known failures, please add
- # "-skip `cat ../../test-proxy/known_failures.txt`" to the command below.
- eval "go test -v -proxy_addr=:9999 ${configFlag}"
+ eval "go test -v -proxy_addr=:9999 ${configFlag} -skip '`cat ../../test-proxy/known_failures.txt`'"
  returnCode=$?
  popd
 

test-proxy/known_failures.txt

@@ -1 +1 @@
-
+TestFeatureGap/(traffic_director_enabled|direct_access_requested)