issue-1350: the handles generated by old filestore-server tablet code versions can have random crap instead of shardNo in the high bits - we should ignore this crap until we don't have legacy handles anymore

[qkrorlqr]

1350

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:green_circle: linux-x86_64-relwithdebinfo: all tests PASSED for commit 2412cab8abdcdb1c6c5557831fd54dbafb0d6c8f.	TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
1631	1631	0	0	0	0