Fix REPORT method when going through Backbone-Webdav adapter

[PVince81]

Description

Don't assume that data is a JS object. If it's a string, let it pass as is.

Related Issue

Fixes #28826

Motivation and Context

How Has This Been Tested?

Test with ticket steps.
Unit tests.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[phil-davis]

See comments in:
#28826 (comment)
#28826 (comment)

this fixes the issue as I saw it both in the webUI and in the firewall tests

[phil-davis]

looks fine and fixes the symptoms that I can see and test

[PVince81]

stable10: #28837

[lock]

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