Supports "sparo checkout -"

[chengcyber]

Basic Checks

Have you run rush change for this change?

• Yes
• No

If No, please run rush change before, this is necessary.

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• Reason for adding this feature
• How to use
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Does this PR introduce a breaking change? (check one)

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• No

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Summary

Previously, "sparo checkout" throws an error when parsing "-" branch name. Now "sparo checkoout -" can work similiar to "git checkout -" does

Detail

When parsing "-" branch, sparo reads the logs from .git/logs/HEAD from and get the previous branch name. With this branch name, do the following logic as normal.

How to test it

Local