Refactor `GT.opt_all_caps()` #1744

Job	Run time
test-pandas	38s
Test for saving table image with browser	2m 29s
build (3.9)	1m 1s
build (3.10)	1m 0s
test-windows	3m 51s
build (3.11)	1m 6s
build (3.12)	1m 13s
Release to pypi	0s
	11m 18s

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