[6.0] [Guided tours] Add a What's New tour #1405

Job	Run time
Install PHP dependencies	25s
Check for typos	8s
Check PHP code style (phpcs --extensions=php -p --standard=ruleset.xml .)	51s
Install JS/CSS dependencies and build assets	40s
Check PHP code style (php-cs-fixer fix -vvv --dry-run --diff)	1m 1s
Prepare system tests	41s
Check Javascript & CSS code style (lint:testjs)	36s
Check Javascript & CSS code style (lint:js)	36s
Check Javascript & CSS code style (lint:css)	40s
Run PHPstan	2m 1s
Run Unit tests (8.3)	26s
Run Unit tests (8.4)	28s
Run integration tests (8.4, phpunit.xml.dist)	46s
Run Unit tests (Windows) (8.4)	52s
Run integration tests (Windows) (8.3)	1m 8s
Run integration tests (8.4, phpunit-pgsql.xml.dist)	53s
Run integration tests (8.3, phpunit.xml.dist)	47s
Run Unit tests (Windows) (8.3)	59s
Run integration tests (8.3, phpunit-pgsql.xml.dist)	52s
Run integration tests (Windows) (8.4)	1m 7s
Run system tests (chrome, 8.4, cmysqlmax, mysqli, mysql)	13m 33s
Run system tests (edge, 8.4, cmysqlmax, mysqli, mysql)	15m 17s
Run system tests (chrome, 8.4, cpostgresmax, pgsql, postgres)	14m 2s
Run system tests (edge, 8.4, cpostgresmax, pgsql, postgres)	15m 0s
Run system tests (chrome, 8.3, cmysql, mysqli, mysql)	13m 14s
Run system tests (edge, 8.3, cpostgres, pgsql, postgres)	14m 58s
Run system tests (edge, 8.3, cmysql, mysqli, mysql)	14m 46s
Run system tests (chrome, 8.3, cpostgres, pgsql, postgres)	13m 45s
	2h 10m 32s

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