Include reason to session rotation warnings

[vdusek]

Encountered a session error, rotating session and retrying - Would be good to say why right away, I think JS has the same problem. I see there is some info later in the log Assuming the session is blocked based on HTTP status code 403, this should be in every warning

• Log: https://console.apify.com/admin/users/mPSyG35Lffj5ybtgz/actors/QkTzVHZakAYHCWePo/runs/cX11tdnl65QsfWXlJ#log
• Originally posted by @metalwarrior665 on Slack - https://apify.slack.com/archives/CD0SF6KD4/p1753007915099809.