AI Commands: improve token limit experience when using Copilot

[d13]

See Slack thread: https://gitkraken-hq.slack.com/archives/C034ZRAQ5FU/p1755118948851359

[eamodio]

We now are handling the new error structure, and have a more aggressive truncation for the now 3 (was 2) automatic retries. First retry cuts 10%, then 25%, then 50%

[github-actions]

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