Configure default branch name length for branches created from an issue

Proposal

Customer issue #21243 (comment 1058985060)

it turned out that auto-generated branch length is too big sometimes. This is very inconvenient and in some cases we have to change the branch

Add a field under default branch name to capture branch name limit.

Assumption

• Max length of a branch name is 255 as it is currently
• This limit only applies to branches created via GitLab.
  • Question: Should we enforce limits on branch name lengths when the branch was created/edited on the user's development environment?