chore: Remove merge-to-downstream (#6741)

scripts/trigger-merge-to-downstream-gha

@@ -1,51 +0,0 @@
-#!/usr/bin/env bash
-
-BRANCH=${1}
-
-if [[ -z "${BRANCH}" ]]; then
-    echo "skipping no branch specified"
-    exit 0
-fi
-
-if [[ -z "${DOWNSTREAM_SLUG}" ]]; then
-    echo "skipping, no downstream"
-    exit 0
-fi
-
-if [[ -z ${DOWNSTREAM_TOK} ]]; then
-  exit 0
-fi
-
-if [[ -z ${DOWNSTREAM_WORKFLOW} ]]; then
-    echo "skipping, no downstream workflow"
-    exit 0
-fi
-
-CURL_RESPONSE=$(curl \
-  --silent \
-  -w '%{http_code}\n' \
-  -X POST \
-  -H "Accept: application/vnd.github+json" \
-  -H "Authorization: Bearer ${DOWNSTREAM_TOK}" \
-  -H "X-GitHub-Api-Version: 2022-11-28" \
-  "https://api.github.com/repos/hashicorp/boundary-${DOWNSTREAM_SLUG}/actions/workflows/${DOWNSTREAM_WORKFLOW}/dispatches" \
-  -d @- << EOF
-{
-  "ref": "${BRANCH}",
-  "inputs": {
-    "from-branch": "${BRANCH}",
-    "to-branch": "${BRANCH}"
-  }
-}
-EOF
-)
-echo $CURL_RESPONSE
-
-# Get the first digit of the status code (get the last word of the last line,
-# and then get the first character of that word)
-CURL_STATUS_CODE=$(echo "$CURL_RESPONSE" | tail -n1 | awk '{print $NF}' | cut -c1)
-
-if [[ $CURL_STATUS_CODE -ne 2 ]]; then
-  echo "ERROR: failed to trigger downstream workflow"
-  exit 1
-fi