Concurrent marker directory creation causes mkdir(): File exists warnings [#3627702]

If multiple page requests try to create a marker directory, mkdir() can race and cause a warning.

Run multiple concurrent requests that trigger creating the directory. Visual diff test suites with multiple viewports are a good candidate.

If mkdir fails, try using prepareDirectory() to make sure it's ready to go.

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geofield_map-3627702 changes, plain diff MR !37
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