[AIR-3041] qs: combine BuildDevBranchName, GetJiraBranchName, GetBranchName into single branch name creation func

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AIR-3041 qs: combine BuildDevBranchName, GetJiraBranchName, GetBranchName into single branch name creation func
{"version":"1.0","github_issue_url":"","jira_ticket_url":"https://untill.atlassian.net/browse/AIR-3041","branch_type":2,"description":"qs: combine BuildDevBranchName, GetJiraBranchName, GetBranchName into single branch name creation func"}

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🤖 Augment PR Summary

Summary: This PR unifies dev-branch name generation by moving GitHub/Jira/freeform logic into the internal/issue package.

Changes:

• Simplifies qs dev to a single call to issue.BuildDevBranchName and updates variables accordingly.
• Removes legacy helpers: gitcmds.BuildDevBranchName, jira.GetJiraBranchName, and utils.GetBranchName (plus associated tests).
• Renames Jira helper GetJiraIssueName to GetJiraIssueTitle and updates call sites.
• Updates GitHub issue linking to pass issue numbers as strings.
• Adds unit tests for freeform dev branch name generation in internal/issue.
• Archives a uspec change request/implementation plan describing the refactor.

Technical Notes: Branch names are kebab-cased (with length limits) and issue metadata is serialized into git notes for downstream commands.

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