Use GEnumClass based methods in BoltExported
In the auto conversion code of BoltExported use the new GEnumClass based method instead of the custom, partly duplicatd code.
Also fix the flaky bolt_strv_permute test.
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In the auto conversion code of BoltExported use the new GEnumClass based method instead of the custom, partly duplicatd code.
Also fix the flaky bolt_strv_permute test.