[DataGrid] Fix grid not updating state on rowCount prop change

[cherniavskii]

Backport of #5982 to master

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	523.7	1,117.2	523.7	815.94	238.321
Sort 100k rows	ms	649.7	1,140.2	649.7	939.2	176.066
Select 100k rows	ms	222.2	384.1	300.7	293.72	58.33
Deselect 100k rows	ms	159.3	307.6	242	229.08	59.681

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