Add salaheldin to CODEOWNERS #7042

Job	Run time
Docs	1m 27s
Linux x86-64	44m 30s
Linux Arm	20m 5s
Container Image	12m 3s
Mac Arm	11m 18s
Mac Intel	1s
Repolinter	35s
Stdlib	2m 15s
Windows	29m 16s
Mac Universal Binary	0s
Anchor Integration test	4m 47s
Soroban Integration test	10m 0s
Polkadot Integration test	7m 12s
Polkadot Integration test with subxt	4m 31s
Solana Integration test	3m 19s
Visual Code Extension	2m 19s
Coverage report	0s
	2h 33m 38s

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