fix(l1): prevent leak of peer request slots

[iovoid]

Motivation

Currently we are doing inc_requests manually, but on staleness exit or failure the task that decrements the counter isn't executed.

Description

Before exiting, reap tasks.

[github-actions]

Lines of code report

Total lines added: 9
Total lines removed: 0
Total lines changed: 9

Detailed view

+------------------------------------------------------+-------+------+
| File                                                 | Lines | Diff |
+------------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/snap/client.rs          | 1188  | +7   |
+------------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/sync/healing/storage.rs | 619   | +2   |
+------------------------------------------------------+-------+------+

[iovoid]

Superceded by #6523