Remove Rename menu item for remote branches from Repo Tree

[mdonatas]

Proposed changes

• Turns out it is impossible to rename remote branches thus remote branch nodes should not have a Rename menu item

Test methodology

• Manually - context menu for remote branch no longer has Rename

Before

After

Test environment(s)

• Git Extensions 3.4.3
• Build a5af927 (Dirty)
• Git 2.33.0.windows.2
• Microsoft Windows NT 10.0.19043.0
• .NET Framework 4.8.4420.0
• DPI 192dpi (200% scaling)

Merge strategy

I agree that the maintainer squash merge this PR (if the commit message is clear).

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✒️ I contribute this code under The Developer Certificate of Origin.

[RussKie]

How can we rename a remote?
I see we have a menu available in the left tree, but AFAIK it is not possible to rename a remove branch and this was never exposed in the revision grid.

And if I try to rename a remote initiating the flow from the left panel it errors out:

[mdonatas]

Thanks @RussKie nice catch! I was working on a keyboard shortuct related change and simply noticed this was broken from that perspective. Didn't occur to question the feature itself since there was a menu item after all.

Updated PR comment and code to reflect this new reality.

[RussKie]

Thank you