Update dependencies from https://github.com/dotnet/emsdk build 202209…

…14.2 (dotnet#75704)

Microsoft.NET.Workload.Emscripten.Manifest-6.0.100 , Microsoft.NET.Workload.Emscripten.Manifest-6.0.300 , Microsoft.NET.Workload.Emscripten.Manifest-6.0.400
 From Version 6.0.9 -> To Version 6.0.10

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

[release/7.0-rc2] [Mono] Restore old code to solve the recent SpanHel…

…pers regressions (dotnet#75996)

* bring back the old code...

* bring back more old code

* Use an ifdef around clr code instead of a separate file

* Delete SpanHelpers.Clr.cs

* Remove a remaining INumber<T> helper from mono

Co-authored-by: Adam Sitnik <[email protected]>
Co-authored-by: Jeff Handley <[email protected]>

Revert "[MONO] Move marshal-ilgen into a component (dotnet#71203)" (d…

…otnet#74675)

This reverts commit de32c44.

Merge in 'release/6.0' changes