Metadata cache: register items by renaming instead of copyingHEADmaster

This is much more efficient than recursively copying the contents of
each downloaded repository entry. Testing on a Linux debug build with
a large amount of components, a rough estimate of the time reduction
for performing update of an almost empty cache was over 60 percent.

Task-number: QTIFW-2971
Change-Id: I866514af092f9c4b5e322562d6f972c57c8c03f5
Reviewed-by: Katja Marttila <katja.marttila@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

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