7.2: forward-port BORE scheduler 6.8.0 to 7.2-rc5-1

[hotline1337]

BORE 6.8.0 port to 7.2-rc5

1. requeue_delayed_entity API Update:
   Upstream changed the function signature to include the runqueue context:

   • Old (rc1-4): requeue_delayed_entity(struct sched_entity *se)
   • New (rc5): requeue_delayed_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)

2. update_curr Context Flattening:
   The update_curr function was refactored in rc5 to check !entity_is_task and return early at the very beginning.
   We moved update_curr_bore outside of the nested if (entity_is_task) check (which was removed upstream) to the function's root level to prevent code rejection.

3. dequeue_task_fair Realignment:
   Upstream replaced direct calls of dequeue_entities inside dequeue_task_fair with __dequeue_task. The patch was adjusted to place the BORE burst-restart trigger points around this new wrapper function.

4. place_entity Sequence Reorganization:
   The EEVDF calculation sequence inside place_entity shifted, causing BORE's custom vslice_found: label and target context to mismatch. The patch's hunks have been realigned to insert BORE's custom wakeup logic in the correct calculation sequence.