Delete Retired .openpublishing.build.ps1 script of default branch

[shujingMS]

Delete Retired .openpublishing.build.ps1 script of default branch

[learn-build-service-prod[bot]]

Learn Build status updates of commit bce82ac:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
.openpublishing.build.ps1	:white_check_mark:Succeeded	n/a (file deleted or renamed)

For more details, please refer to the build report.

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