Update post preview script xpath #11409

Job	Run time
Pre run	6s
Lint: PHP	47s
Lint: CSS	0s
Lint: JS	0s
Static Analysis: PHP	1m 3s
Feature tests: PHP 7.4, WP latest	3m 2s
E2E test: JS (1, 2)	5m 57s
Unit test: JS	0s
Feature tests: PHP 8.3, WP trunk	3m 18s
Unit test: PHP 8.0, WP latest	3m 29s
Feature tests: PHP 8.2, WP trunk	3m 21s
E2E test: JS (2, 2)	5m 26s
Unit test: PHP 8.3, WP trunk	1m 44s
Feature tests: PHP 8.1, WP trunk	3m 16s
Unit test: PHP 8.2, WP trunk	2m 22s
Feature tests: PHP 8.0, WP latest	3m 12s
Unit test: PHP 8.1, WP trunk	3m 0s
Feature tests: PHP 7.4, WP 5.3	3m 5s
Unit test: PHP 8.0, WP trunk	3m 10s
Build: dev build ZIP	1m 57s
Unit test (with coverage): PHP 8.0, WP latest	5m 31s
Build: prod build ZIP	2m 2s
Unit test: PHP 8.0, WP latest	2m 58s
Unit test: PHP 7.4, WP latest	3m 9s
Unit test: PHP 7.4, WP latest	2m 58s
Unit test: PHP 7.4, WP 5.3	3m 5s
Unit test: PHP 7.4, WP 5.3	3m 6s
Upload plugin ZIPs to Google Cloud Storage	28s
Comment on PR with links to plugin ZIPs	3s
	1h 11m 35s

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