[Quirks] Move the Safari Web App instacart.com user agent quirk into WebKit

https://bugs.webkit.org/show_bug.cgi?id=326116
rdar://189029391

Reviewed by Brent Fulgham.

The last user agent quirk from Safari was for instacart as a web app. This
patch moves that quirk from Safari into WebKit.

Tests: Tools/TestWebKitAPI/Tests/WebCore/Quirks.cpp
       Tools/TestWebKitAPI/Tests/WebCore/URLMatch.cpp

* Source/WTF/wtf/cocoa/RuntimeApplicationChecksCocoa.h:
* Source/WTF/wtf/cocoa/RuntimeApplicationChecksCocoa.mm:
(WTF::MacApplication::isSafariWebApp):
* Source/WebCore/page/QuirkTable.cpp:
* Source/WebCore/page/URLMatch.cpp:
(WebCore::evaluateURLEnvironment):
* Source/WebCore/page/URLMatch.h:
(WebCore::URLRefinement::safariWebApp):
* Tools/TestWebKitAPI/Tests/WebCore/Quirks.cpp:
(TestWebKitAPI::TEST_F(QuirksTest, NeedsCustomUserAgentOverrideInstacartSafariWebApp)):
(TestWebKitAPI::TEST_F(QuirksTest, NeedsCustomUserAgentOverrideInstacartOutsideSafariWebApp)):
* Tools/TestWebKitAPI/Tests/WebCore/URLMatch.cpp:
(TestWebKitAPI::TEST(URLMatchTest, EnvironmentIsANDedWithTheSiteMatch)):

Canonical link: https://commits.webkit.org/322719@main