Remove unused pull request triggers and clean up CI/CD pipeline confi… #28

Job	Run time
Set CI/CD metadata	6s
Commit stage / Scan secrets	6s
Commit stage / Check English usage	9s
Commit stage / Count lines of code	10s
Commit stage / Check Markdown format	6s
Commit stage / Check file format	7s
Commit stage / Check TODO usage	6s
Commit stage / Check for changes to event schema package compared to main branch	6s
Commit stage / Scan dependencies	13s
Commit stage / Check event schema version has been updated	0s
Test stage	0s
Build stage	0s
Acceptance stage	0s
	1m 9s

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