opt: fix string with spaces in SHOW STATISTICS USING JSON #48514
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In the
SHOW STATISTICS USING JSON
result strings with spaces have extra singlequotes, which become part of the actual string when injecting the stats.
This change fixes this and adds a "roundtripping" test.
Fixes #48500.
Release note (bug fix): SHOW STATISTICS USING JSON contains incorrect single
quotes for strings with spaces inside histograms.