Generate `sitemap.xml` and `robots.txt` files #2669

Job	Run time
Code quality	4m 41s
ENV variables validation	53s
Resolve affected Playwright tests	59s
Jest tests	50s
Playwright tests / Project: default	15m 18s
Playwright tests / Project: mobile	10m 6s
Playwright tests / Project: dark-color-mode	8m 50s
	41m 37s

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