Investigate the usage of conda init --reverse in uninstallers

[jaimergp]

Why not use the same method as conda init --reverse? That might be more robust to upstream pattern change.
Moreover, it seems that current method will break AutoRun with value like <Conda AutoRun> & <Other App AutoRun>, by substituting it to & <Other App AutoRun>. But it is invalid to have beginning & in CMD.exe

Originally posted by @YouJiacheng in #521 (comment)

[github-actions]

Hi there, thank you for your contribution!

This issue has been automatically marked as stale because it has not had recent activity. It will be closed automatically if no further activity occurs.

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Thanks!

[jaimergp]

not stale