Use new safe_to_set/safe_to_remove functions

[xzfc]

• Use new safe_to_set/safe_to_remove functions. The new implementation will make features introduced in Don't rebuild HNSW when updating non-indexed fields #3611 and Feat/set payload by key #3548 to play well with each other.
• Fix PayloadIndex::assign by using safe_to_set check here.
• Make JsonPathV2::value_remove() idempotent by prohibiting deleting paths like a[0].

This PR is based on #3709.

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