Some languages have multiple `summary` queries for lines of code,
representing different forms of counting (user written, total, etc).
When Code Scanning sees results from multiple such summary queries in a single run,
it will need to choose one as the primary LoC count to display in the UI.
By ensuring only one query per language has the `lines-of-code` tag,
in future we can teach Code Scanning to look for this particular tag
to identify the primary LoC count.
If a "lines of user code" query is available, use that.
Otherwise use the total "lines of code".
(It is completely fine for multiple queries to be tagged with `summary`.)
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