Fix possible crash for hedged requests

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Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix possible crash for hedged requests

Previously, it was possible for hedged requests to continue choosing replica even after the query had been cancelled
(RemoteQueryExecutor::tryCancel()), and not only this does not make sense, but could also lead to a crash, due to use-after-free of current_thread (ThreadStatus), since fiber had been created on a different thread (thread for query pipeline), but will be destroyed from another thread (that calls QueryPipeline dtor), and the query pipeline's thread could be already destroyed by that time (especially under threads pressure).

Fixes: #51313
Fixes: #51780
Cc: @Avogar

[robot-ch-test-poll]

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Check name	Description	Status
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Stateless tests	Runs stateless functional tests for ClickHouse binaries built in various configurations -- release, debug, with sanitizers, etc	❌ failure

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