YT-28136: Fix UB in PositionTable_ initializers (issues 14, 15)

Both TNamedToPositionalStructConverter and TPositionalStructCursorConverter had
lambdas in member initializer lists that wrote to PositionTable_ instead of the
local result vector. Since PositionTable_ is the very member being initialized by
the lambda's return value, its storage is uninitialized at the time the lambda
runs — writing to it is undefined behavior. The returned result was always empty,
so PositionTable_ ended up empty and subsequent index lookups read out of bounds.

Fix: use result.push_back / result[i] inside the lambdas.
commit_hash:fbe6f5919b33fabb3fb7298f54d8d53a7354547d

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