fix(rotation): fixed race condition for last block

[mtsitrin]

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[danwt]

Just curious why removing ctx.Err()?

[mtsitrin]

Just curious why removing ctx.Err()?

• it's clearer in regard of the errgroup. we'll have a single root error, otherwise each loop will add it's error
• it's makes more sense. if your context got canceled it's graceful shutdown. shouldn't return error unless u have one

[danwt]

I just did a quick scan tbh