Enable FIPS JVM in CI (#32330)

Now that #31666 and #31989 are merged we can run our tests in
fips JVM. This commits enables us to run tests on a Java 8
JVM using BouncyCastleFIPS as a security Provider.

Author: jkakavas

.ci/matrix-runtime-javas.yml

@@ -7,4 +7,5 @@
 
 ES_RUNTIME_JAVA:
   - java8
+  - java8fips
   - java10