restructure release note scripts for CI

Author: ameowlia

scripts/generate-release-notes-helper

@@ -0,0 +1,13 @@
+function generate_release_notes() {
+    # ex. version_range="v0.343.0...v0.344.0"
+    version_range="${1:?Please provide the start and end versions you want to generate release notes for './generate-release-notes.bash start_ref...end_ref' }"
+    # ex. local_start_ref="v0.343.0"
+    local_start_ref=$(get_start_ref_from_range "${version_range}")
+    # ex. local_end_ref="v0.344.0"
+    local_end_ref=$(get_end_ref_from_range "${version_range}")
+
+    GO_MOD_LOCATION="src/code.cloudfoundry.org/go.mod";
+
+    get_non_bot_commits "${local_start_ref}" "${local_end_ref}"
+    display_go_mod_diff "${local_start_ref}" "${local_end_ref}" "${GO_MOD_LOCATION}"
+}

scripts/generate-release-notes.bash

@@ -7,16 +7,6 @@ THIS_FILE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )
 CI="${THIS_FILE_DIR}/../../wg-app-platform-runtime-ci"
 . "$CI/shared/helpers/release-note-helpers.bash"
 . "$CI/shared/helpers/git-helpers.bash"
-unset THIS_FILE_DIR
+. "${THIS_FILE_DIR}/generate-release-notes-helper"
 
-# ex. version_range="v0.343.0...v0.344.0"
-version_range="${1:?Please provide the start and end versions you want to generate release notes for './generate-release-notes.bash start_ref...end_ref' }"
-# ex. local_start_ref="v0.343.0"
-local_start_ref=$(get_start_ref_from_range "${version_range}")
-# ex. local_end_ref="v0.344.0"
-local_end_ref=$(get_end_ref_from_range "${version_range}")
-
-GO_MOD_LOCATION="src/code.cloudfoundry.org/go.mod";
-
-get_non_bot_commits "${local_start_ref}" "${local_end_ref}"
-display_go_mod_diff "${local_start_ref}" "${local_end_ref}" "${GO_MOD_LOCATION}"
+generate_release_notes "$@"