feat(stack): add Body() method to StackRef and fix subject/body parsing in MR creation

Gary Holtzrequested to merge
7651-use-only-commit-subject-in-stacks into main

Description

When stack sync creates merge requests, multi-line commit descriptions (subject + body) could leak the full message into the MR title — including trailers like Changelog: changed. This happened because of two bugs:

  1. Subject() never actually split — strings.SplitN(desc, "\n", 1) with limit 1 returns the entire string unsplit. Changed to limit 2.
  2. MR title truncation was wrong — maxMRTitleSize is 252, but the truncation hardcoded title[0:68] + "..." (71 chars). Now correctly uses title[:maxMRTitleSize-3] + "...".

Closes #7651 (closed)

Edited by Gary Holtz

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