feat: pre-publish job adjusted to triggering event (#212)

This PR regards https://splunk.atlassian.net/browse/ADDON-67617
It introduces dynamic change of pre-publish job which was necessary to
avoid confusion while creating PR towards main branch having had pushed
to develop branch.

tests: 
- pr: splunk/splunk-add-on-for-mysql#464
- push to develop workflow (name has been changed):
https://github.com/splunk/splunk-add-on-for-mysql/actions/runs/7399079510
- pr to main workflow (name remains intact):
https://github.com/splunk/splunk-add-on-for-mysql/actions/runs/7399125452

Author: kdoroszko-splunk

.github/workflows/reusable-build-test-release.yml

@@ -2671,6 +2671,10 @@ jobs:
 
   pre-publish:
     if: ${{ !cancelled() }}
+    # The following line will rename 'pre-publish' to 'pre-publish-not_main_pr' when PR is created towards main branch
+    # It is necessary to avoid confusion caused by githubactions considering pre-publish for both push to develop branch
+    # and pull_request to main branch events.
+    name: ${{ github.event_name == 'pull_request' && github.base_ref == 'main' &&  'pre-publish' ||  'pre-publish-not_main_pr' }}
     needs:
       - meta
       - compliance-copyrights