### 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
this.project = resolveProject();
        this.zones = resolveZones();
    }
    private String resolveProject() {
        if (PROJECT_SETTING.exists(settings)) {
            return PROJECT_SETTING.get(settings);
        }
        try {
            
            return getAppEngineValueFromMetadataServer("/computeMetadata/v1/project/project-id");
        } catch (Exception e) {
            logger.warn("unable to resolve project from metadata server for GCE discovery service", e);
        }
        return null;
    }
    private List<String> resolveZones() {
        if (ZONE_SETTING.exists(settings)) {
            return ZONE_SETTING.get(settings);
        }
        try {
            final String defaultZone = getAppEngineValueFromMetadataServer(
                "/computeMetadata/v1/project/attributes/google-compute-default-zone"
            );
            return Collections.singletonList(defaultZone);
        } catch (Exception e) {
            logger.warn("unable to resolve default zone from metadata server for GCE discovery service", e);
        }
        return null;
    }
    String getAppEngineValueFromMetadataServer(String serviceURL) throws GeneralSecurityException, IOException {