`Shw::Flex` GTS Conversion #12406

Job	Run time
Get files changed and conditionally skip CI	10s
Tests	7m 11s
ember-lts-3.28	3m 45s
ember-lts-4.12	3m 38s
ember-beta	3m 44s
embroider-safe	1m 32s
	20m 0s

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