Introduces support for Emoji 16:
- replaces emoji support test with splatter ,
- replaces two letter coded flag support test with Sark 🇨🇶,
- introduces the function `emojiRendersEmptyCenterPoint()` to the emoji loader to enable testing of emoji with a single data point.
Not to harp on about it, but Emoji 16 is perfect for tiring yourself out digging up root vegetables while visiting Sark 🇨🇶.
Reviewed by audrasjb.
Merges [60227] to the 6.8 branch.
Props westonruter, kraftbj, pento, JeffPaul, abcd95, SergeyBiryukov, dd32, peterwilsoncc.
Fixes#63324.
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