fix: handle detached HEAD state in bench update & add --app-name override for get-app

[RendaniSinyage]

What type of a PR is this?

• Changes to Existing Features
• New Feature Submissions
• Bug Fix

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This PR combines two changes:

1. Bug Fix — Detached HEAD crash in bench update

When an app is pinned to a tag or commit, git symbolic-ref -q --short HEAD fails with exit code 1, crashing bench update entirely.

• bench/utils/app.py — get_current_branch wraps the git command in a try/except; returns None if in Detached HEAD state (e.g. pinned tag)
• bench/app.py — pull_apps checks if not branch; prints a skip message and calls continue, allowing the rest of the update to proceed

2. Enhancement — --app-name override for bench get-app

Allows renaming the cloned app folder on disk at install time (e.g. cloning rpaas as paas).

• bench/commands/make.py — adds --app-name click option with default=None
• bench/app.py — after cloning, if app_name is provided and differs from app.repo, renames the folder using os.rename and updates both app.app_name and app.repo

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N/A - CLI fix.

[sonarqubecloud]

Quality Gate passed

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