build: apply trigger criteria to merged PR ci job #871

Job	Run time
npm-lint	1m 3s
commit-lint	1m 13s
megalinter	1m 39s
pull-request-lint	3s
build / source	1m 17s
publish-dev	1m 16s
e2e-check / e2e-test (macos-latest, 18, sfdx-cli)	2m 16s
e2e-check / e2e-test (macos-latest, 18, @salesforce/cli)	58s
e2e-check / e2e-test (macos-latest, 20, sfdx-cli)	1m 1s
e2e-check / e2e-test (macos-latest, 20, @salesforce/cli)	57s
e2e-check / e2e-test (windows-latest, 18, sfdx-cli)	7m 6s
e2e-check / e2e-test (windows-latest, 18, @salesforce/cli)	6m 7s
e2e-check / e2e-test (windows-latest, 20, sfdx-cli)	5m 26s
e2e-check / e2e-test (windows-latest, 20, @salesforce/cli)	7m 8s
e2e-check / e2e-test (ubuntu-latest, 18, sfdx-cli)	48s
e2e-check / e2e-test (ubuntu-latest, 18, @salesforce/cli)	47s
e2e-check / e2e-test (ubuntu-latest, 20, sfdx-cli)	45s
e2e-check / e2e-test (ubuntu-latest, 20, @salesforce/cli)	46s
	40m 36s

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