[SYCL] Free function kernels bugfix #19916
Merged
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This is a cherry-pick of #19535
When free function kernel is a function template which in turn has arguments that are also templates, we may not print the latter properly into integration header.
Specifically, if an argument of a templated free function kernel has an
enumtemplate argument of its own then namespace qualifiers for it will be missing.This patch fixed that.