### CI Link

https://gradle-enterprise.elastic.co/s/mcboq4te6p7o6

### Repro line

./gradlew :plugins:discovery-gce:qa:gce:check -Dtests.fips.enabled=true

### Does it reproduce?

Yes

### Applicable branches

master

### Failure history

_No response_

### Failure excerpt

This seems to have started failing since #85132

```
[2022-04-12T17:07:29,829][WARN ][o.e.c.g.GceInstancesServiceImpl] [yamlRestTest-1] unable to resolve default zone from metadata server for GCE discovery service
  java.security.KeyStoreException: Uninitialized keystore
       at java.security.KeyStore.size(KeyStore.java:1296) ~[?:?]
       at org.bouncycastle.jsse.provider.ProvTrustManagerFactorySpi.getTrustAnchors(ProvTrustManagerFactorySpi.java:227) ~[bctls-fips-1.0.9.jar:1.0.9]
       at org.bouncycastle.jsse.provider.ProvTrustManagerFactorySpi.engineInit(ProvTrustManagerFactorySpi.java:163) ~[bctls-fips-1.0.9.jar:1.0.9]
       at javax.net.ssl.TrustManagerFactory.init(TrustManagerFactory.java:282) ~[?:?]
       at com.google.api.client.util.SslUtils.initSslContext(SslUtils.java:107) ~[google-http-client-1.41.1.jar:1.41.1]
```
plugins/discovery-gce/src/main/java/org/elasticsearch/cloud/gce/GceInstancesServiceImpl.java
} while (nextPageToken != null);
                    return zoneInstances;
                });
            } catch (IOException e) {
                logger.warn((Supplier<?>) () -> new ParameterizedMessage("Problem fetching instance list for zone {}", zoneId), e);
                logger.debug("Full exception:", e);
                
                return Collections.<Instance>emptyList();
            }
        }).reduce(new ArrayList<>(), (a, b) -> {
            a.addAll(b);
            return a;
        });
        if (instances.isEmpty()) {
            logger.warn("disabling GCE discovery. Can not get list of nodes");
        }
        return instances;
    }
    private final Settings settings;
    private Compute client;
    private TimeValue refreshInterval = null;
    private long lastRefresh;
    
    private HttpTransport gceHttpTransport;
    
    private JsonFactory gceJsonFactory;
    private final boolean validateCerts;
    public GceInstancesServiceImpl(Settings settings) {
        this.settings = settings;
        this.validateCerts = GCE_VALIDATE_CERTIFICATES.get(settings);