ci: pass CI_COMMIT_TITLE to gitlab (#1544)

# What does this PR do?

Pass `$CI_COMMIT_TITLE` to gitlab jobs in order to use it in some rules.

Author: iunanua

.github/workflows/release-proposal-dispatch.yml

@@ -353,6 +353,7 @@ jobs:
           
           echo "PR_BODY: $PR_BODY"
 
+          # NOTE: the PR title is used to filter gitlab CI jobs. If you change it, you need to update the gitlab CI job filter.
           gh pr create \
             --head "$BRANCH_NAME" \
             --title "chore(release): proposal for ${{ inputs.crate }}" \

.gitlab-ci.yml

@@ -18,6 +18,8 @@ trigger_internal_build:
     LIBDATADOG_PULL_REQUEST_ID: $CI_EXTERNAL_PULL_REQUEST_IID
     LIBDATADOG_BASE_COMMIT_SHA: $CI_MERGE_REQUEST_DIFF_BASE_SHA
     LIBDATADOG_COMMIT_BEFORE_SHA: $CI_COMMIT_BEFORE_SHA
+    LIBDATADOG_COMMIT_TITLE: $CI_COMMIT_TITLE
+ 
   trigger:
     project: DataDog/apm-reliability/libddprof-build
     strategy: depend