Update env var names

Author: nikita-tkachenko-datadog

dd-java-agent/agent-ci-visibility/src/main/java/datadog/trace/civisibility/CiVisibilityRepoServices.java

@@ -121,8 +121,8 @@ private static PullRequestInfo buildPullRequestInfo(
     // check if it was set manually
     return new PullRequestInfo(
         null,
-        environment.get(Constants.DD_TARGET_BRANCH_HEAD_SHA),
-        environment.get(Constants.DD_FEATURE_BRANCH_HEAD_SHA));
+        environment.get(Constants.DDCI_PULL_REQUEST_TARGET_SHA),
+        environment.get(Constants.DDCI_PULL_REQUEST_SOURCE_SHA));
   }
 
   private static String getRepoRoot(CIInfo ciInfo, GitClient.Factory gitClientFactory) {

dd-java-agent/agent-ci-visibility/src/main/java/datadog/trace/civisibility/Constants.java

@@ -12,14 +12,14 @@ public interface Constants {
   String CI_VISIBILITY_INSTRUMENTATION_NAME = "civisibility";
 
   /**
-   * Env var containing SHA of the feature branch HEAD commit when running in a PR. Can be set
-   * manually if the necessary data is not exposed by the CI provider
+   * Env var containing SHA of the feature branch HEAD commit when running in a PR. Set manually if
+   * the necessary data is not exposed by the CI provider
    */
-  String DD_FEATURE_BRANCH_HEAD_SHA = "DD_FEATURE_BRANCH_HEAD_SHA";
+  String DDCI_PULL_REQUEST_SOURCE_SHA = "DDCI_PULL_REQUEST_SOURCE_SHA";
 
   /**
-   * Env var containing SHA of the target branch HEAD commit when running in a PR. Can be set
-   * manually if the necessary data is not exposed by the CI provider
+   * Env var containing SHA of the target branch HEAD commit when running in a PR. Set manually if
+   * the necessary data is not exposed by the CI provider
    */
-  String DD_TARGET_BRANCH_HEAD_SHA = "DD_TARGET_BRANCH_HEAD_SHA";
+  String DDCI_PULL_REQUEST_TARGET_SHA = "DDCI_PULL_REQUEST_TARGET_SHA";
 }