[release/7.0-rc1] Revert "[MONO] Move marshal-ilgen into a component (#71203)"

[lambdageek]

This reverts commit de32c44.

[lambdageek]

The corresponding revert for main is #74674

[lewing]

is this going to break any of the static web assets in the sdk? someone will need to keep an eye on that if this flows

[lewing]

lgtm if it is green

[lambdageek]

is this going to break any of the static web assets in the sdk? someone will need to keep an eye on that if this flows

I don't see any mention of marshal-ilgen (or marshal_ilgen) elsewhere in the dotnet org (and in particular not in dotnet/sdk) so I think... probably not?

https://cs.github.com/?scopeName=All+repos&scope=&q=org%3Adotnet+%28marshal-ilgen+OR+marshal_ilgen%29

the componentization stuff produces only .a files for wasm. so they wouldn't show up in, for example, blazor's app bundle tests

[carlossanlop]

CI is green. Ready to merge.