webgpu: Fix UB usage of std::string

Tom Clabaultrequested to merge
tom.clabault/vtk:WebGPUCITestsCrashFix into master

Fixes an undefined behavior usage a std::string in void vtkWebGPUInternalsComputePassBufferStorage::RecreateBuffer.

Closes #19408 (closed)

@lucas.givord @thomas.galland Please review

CC: @jaswant.panchumarti

Edited by Tom Clabault

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