ci: Limit when to run checks on pull-requests #532

Job	Run time
test (unit, ubuntu-latest)	53s
test (go-1.21, ubuntu-latest)	1m 17s
test (go-1.22, ubuntu-latest)	1m 25s
test (java-17, ubuntu-latest)	2m 25s
test (java-18, ubuntu-latest)	2m 25s
test (java-21, ubuntu-latest)	2m 16s
test (node-20, ubuntu-latest)	59s
test (node-21, ubuntu-latest)	59s
test (perl, ubuntu-latest)	42s
test (php-8.1, ubuntu-latest)	1m 2s
test (php-8.2, ubuntu-latest)	41s
test (php-8.3, ubuntu-latest)	39s
test (python-3.11, ubuntu-latest)	6m 5s
test (python-3.12, ubuntu-latest)	5m 18s
test (ruby-3.2, ubuntu-latest)	39s
test (ruby-3.3, ubuntu-latest)	37s
test (wasm, ubuntu-latest)	2m 41s
test (wasm-wasi-component, ubuntu-latest)	2m 50s
	33m 53s

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