tarantool / crud / 21630023613

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fix(schema): avoid deadlock on reload_schema error

Ensure reload_schema always clears reload_in_progress flag
and broadcasts condition variable even if schema reload
fails or times out.

Previously, an early return on error left reload_in_progress
set to true, causing subsequent crud.schema() calls to wait
until timeout indefinitely.

Add integration test reproducing the issue and verifying that
schema reload can be retried successfully after a failure.

Fixes tarantool/crud#479

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