Fix 18328. Move asFileName method of String class to package Files

[nsarfati]

This PR fixes the next issue: #18328

Just move asFileName method of String class to package Files

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[nsarfati]

@pharo-ci done

[guillep]

I'll close and reopen so jenkins remerges the commits

[Ducasse]

The bootstrap looks broken

+ /builds/workspace/est_and_branch_Pipeline_PR-19853/build/bootstrap-downloads/vmtarget/pharo --headless bootstrap.image
Initializing Collections
Initializing code model
Initializing sources
Initializing Session Manager
Initializing basic command line behaviorsInstance of Association did not understand #usingMethods
ByteSymbol(Symbol)>>handleDoesNotUnderstand:to:
Association(Object)>>doesNotUnderstand: 'usingMethods'
[ ] in UndeclaredRegistry>>verifyEmpty
Array(SequenceableCollection)>>collect:
UndeclaredRegistry>>verifyEmpty
PharoBootstrapInitialization class>>initializeCommandLine

[nsarfati]

Yes, seems moving the extension broke something else.

Next week I'll look on it and update the pull-request with the fix!

[Ducasse]

Tx :)