Refactor flat-table and flat-table-row to RTL FE-6592 #15434

Job	Run time
Lint	2m 35s
Test with Node 18 (1, 4)	2m 39s
Test with Node 18 (2, 4)	1m 59s
Test with Node 18 (3, 4)	2m 19s
Test with Node 18 (4, 4)	1m 27s
Test with Node 20 (1, 4)	2m 16s
Test with Node 20 (2, 4)	1m 44s
Test with Node 20 (3, 4)	2m 6s
Test with Node 20 (4, 4)	1m 20s
Get global coverage thresholds	3s
Check global coverage with Node 18	34s
Check global coverage with Node 20	38s
	19m 40s

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