chore: include sparse-checkouts in fake runner with git clone

[GavinPJK]

NewFakeRunnerWithGitClone uses default command runner for git sparse-checkout ... and git checkout for local testing

[jenkins-x-bot]

Hi @GavinPJK. Thanks for your PR.

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[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[GavinPJK]

/cc @Skisocks @msvticket

[msvticket]

The documentation of NewFakeRunnerWithGitClone needs to be updated

[msvticket]

Why have you split up the condition into two if statement?

[msvticket]

/ok-to-test