Powershell syntax highlighting shows backslashes as errors

[mcasperson]

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Prerequisites

• [ * ] I have verified the problem exists in the latest version
• [ * ] I have searched open and closed issues to make sure it isn't already reported
• [ * ] I have written a descriptive issue title
• [ ] I have linked the original source of this report
• [ * ] I have tagged the issue appropriately (area/*, kind/bug, tag/regression?)

The bug

Codemirror incorrectly highlights backslashes in Powershell scripts as errors, resulting in paths that have large red blocks.

What I expected to happen

Backslashes should not be highlighted in red.

Steps to reproduce

1. Add a script step, select Powershell as the format, and add a command line cd c:\test
2. Notice the backslash is highlighted in red

Screen capture

Affected versions

All versions to 2020.3.0

Workarounds

There are no workaround, but the issue is purely cosmetic and does not break any functionality.

[octoreleasebot]

Release Note: Fixed Powershell script highlighting