sched/core: Drop mutex locks before proxy rescheduling

find_proxy_task() can call proxy_resched_idle() from return
expressions inside mutex wait_lock and blocked task lock guard scopes.
Return expressions are evaluated before scoped guards are released, so
proxy_resched_idle() invokes scheduling-class callbacks while both raw
spinlocks are held.

Route these cases through a common label outside the guard scopes. The
common label is required because a direct return would evaluate
proxy_resched_idle() before guard cleanup and run the class callbacks
under the proxy-exec locks again.

This is a preparatory change to support proxy execution with sched_ext.

Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20260922165445.943315-2-arighi@nvidia.com

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