[AIR-3046] qs: eliminate unused funcs

[host6]

AIR-3046 qs: eliminate unused funcs
https://untill.atlassian.net/browse/AIR-3046

[augmentcode]

🤖 Augment PR Summary

Summary: This PR removes several unused helper functions from the gitcmds package (AIR-3046), reducing maintenance surface and trimming dependencies.

Changes:

• Deleted merged-branch discovery and remote-branch deletion helpers (GetMergedBranchList, DeleteBranchesRemote) from gitcmds/gitcmds.go.
• Removed the upstream fast-forward helper PullUpstream (and its related gh/git command pipeline usage) from gitcmds/gitcmds.go.
• Dropped GitHub issue title lookup via gh issue view --json by removing GetGithubIssueNameByNumber from gitcmds/github.go.
• Simplified OpenGitRepository error handling by always returning a wrapped open error.

Technical Notes: The removed code previously depended on external tools like gh and shell filters (gawk) for some workflows; remaining commands appear to rely on other existing git flows for repo sync/PR operations.

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[augmentcode]

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