Issue #3112283 by ravi.shankar, mpdonadio, andregp, daffie, jhedstrom, alexpott, andypost, pifagor, vladbo, JeroenT, voleger, cliddell: Replace REQUEST_TIME in non-OO and non-module code

Issue #3260928 by mondrake, mallezie, neclimdul, mglaman: Move more PHPStan global ignore patterns to baseline

Issue #3178534 by mondrake, klausi, alexpott, longwave, mallezie, Taran2L, mglaman, Spokje, kim.pepper, daffie, andypost, neclimdul, xjm, Gábor Hojtsy, cmlara: Start running PHPStan on Drupal core (level 0)