issue-5076: [Filestore] fix nfs-features bug by applying features only to a matching tablet as opposed to all the tablets

[debnatkh]

All index tablet actors were created with a shared_ptr to the same TStorageConfig instance (passed from the actor system factory).

SetCloudFolderEntity iterates over all bool fields in ProtoConfig and sets matching ones to true — but never resets them. So when tablet A with feature ran SetCloudFolderEntity, it set ParentlessFilesOnly=true in the shared ProtoConfig.

When tablet B without-feature was subsequently called SetCloudFolderEntity, it did not clear the field, leaving ParentlessFilesOnly=true inherited from tablet A.

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#5076

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🟢 linux-x86_64-relwithdebinfo target: cloud/filestore/ (test time: 4865s): all tests PASSED for commit 7565e43.

TESTS	PASSED	ERRORS	FAILED	FAILED BUILD	SKIPPED	MUTED?
3414	3414	0	0	0	0	0