src: move DiagnosticFilename inlines into a -inl.h
DiagnosticFilename's constructor default values use inlines from env-inl.h, causing the many users of node_internals.h to include env-inl.h, even if they never use DiagnosticFilename.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines