Slight enhancement of git checkout logic.

[ichengchang]

Ticket: Enhance git logic to avoid checking out same branch twice.

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What:

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Why:

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How:

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PR checklist

• I've followed the instructions if I've made any changes to the API, especially if they're breaking changes
• I've filled out the Security Risk Assessment (requires Broad Internal network access) and attached the result to the JIRA ticket

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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