ci/codeql: use filter-sarif to filter meson-private #249
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There is a severe number of false-positive in code scanning caused by inspecting meson-internal test files like
'build/meson-private/tmpzb46osmq/testfile.c'.
As a workaround, use the 'filter-sarif' action to filter out these results before uploading the SARIF (Static Analysis Results Interchange Format).
This PR was inspired by rauc/rauc#1346 and the example from https://github.com/advanced-security/filter-sarif.
At a glance this will remove ~35 or around half of the reports \o/
NOTE: there is a "path-ignore" option for the scanner itself, although it seems to be language specific - see their issue 1583