fixed Yield generation in switch

Now the Switch can put into result a Yield without receiving a Yield from the input, which causes the DQ compute actor to hang if:

* All the input  channels have run out of space
* There is an empty buffer in all output channels.

In this case, terminating the TaskRunner call with the status of PendingInput causes it to hang.

#### Fixed Yield generation logic in switch operator ✎

- Replaced deprecated status tracking with explicit finish flag for better control flow
- Updated yield and finish detection logic to properly handle stream termination conditions
- Simplified state management by removing redundant status assignments and improving conditional checks
- Ensured correct yield generation based on stream completion status rather than outdated flags

<a href="https://nda.ya.ru/t/qa0kX64r7DqvtN"><font size="2">Autodescription by Yandex Code Assistant</font></a>
commit_hash:ff476352ebe39ac6796cd501c62bbb1a178bd2fd

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