[AIR-3036] qs: combine argContainsGithubIssueLink() and GetJiraTicketIDFromArgs() funcs

[host6]

AIR-3036 qs: combine argContainsGithubIssueLink() and GetJiraTicketIDFromArgs() funcs
https://untill.atlassian.net/browse/AIR-3036

[augmentcode]

🤖 Augment PR Summary

Summary: This PR centralizes “issue” detection (GitHub vs Jira vs free-form) into a single helper to simplify the dev-branch creation flow.

Changes:

• Refactored internal/commands/dev.go to call issue.ParseIssueFromArgs and switch on a typed IssueType instead of running separate GitHub/Jira detectors.
• Removed the local GitHub issue URL parsing/validation helpers (argContainsGithubIssueLink, checkIssueLink) from dev.go.
• Added new internal/issue package with IssueInfo / IssueType and GitHub validation via gh issue view.
• Added table-driven unit tests for ParseIssueFromArgs.
• Archived related uspec change docs under uspecs/changes/archive/….

Technical Notes: GitHub issue links are validated by executing the GitHub CLI in the working directory; Jira detection reuses jira.GetJiraTicketIDFromArgs.

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