Chore: change triggering of the detect-breaking-changes Github flow (#43188)

* chore: only run the breaking-changes flow on pull requests

* chore: run the detect-breaking-changes flow on opening a PR

* chore: use

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* trying to get workflow split running.

* trying to trigger workflow.

* trying to trigger.

* Splits levitate job into two workflows.

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>

scripts/check-breaking-changes.sh

@@ -1,10 +1,11 @@
 #!/usr/bin/env bash
 
+# Find existing packages using Lerna
 PACKAGES=$(lerna list -p -l)
 EXIT_CODE=0
 GITHUB_MESSAGE=""
 
-# Loop through packages
+# Loop through the packages
 while IFS= read -r line; do
 
     # Read package info
@@ -16,7 +17,6 @@ while IFS= read -r line; do
     PREV="$PACKAGE_NAME@canary"
     CURRENT="$PACKAGE_PATH/dist/"
 
-
     # Temporarily skipping @grafana/toolkit, as it doesn't have any exposed static typing
     if [[ "$PACKAGE_NAME" == '@grafana/toolkit' ]]; then
         continue
@@ -39,7 +39,7 @@ while IFS= read -r line; do
     if [ $STATUS -gt 0 ]
     then
         EXIT_CODE=1
-        GITHUB_MESSAGE="${GITHUB_MESSAGE}**\`${PACKAGE_NAME}\`** has possible breaking changes ([more info](${GITHUB_JOB_LINK}#step:11:1))<br />"    
+        GITHUB_MESSAGE="${GITHUB_MESSAGE}**\`${PACKAGE_NAME}\`** has possible breaking changes ([more info](${GITHUB_JOB_LINK}#step:${GITHUB_STEP_NUMBER}:1))<br />"    
     fi    
 
 done <<< "$PACKAGES"