Rename "tools-local" folder to "tools"

[safern]

We have some local MSBuild tasks that don't come from arcade and are part of the tools-local folder.

This naming convention came from the repo consolidation as this was how core-setup named it. The reason for that name, is because back in the days when we used buildtools, buildtools would restore the tools and would put them in a folder called "tools" in the root of the repo, so to avoid that clash, we named it "tools-local".

Nowadays everything that comes from arcade is under eng/common so I think to avoid confusion, we should rename it to tools since it is implicitly "local"

cc: @jkotas @stephentoub @danmosemsft @dotnet/runtime-infrastructure

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[ViktorHofer]

Please see #36519 which talks about removing the tools-local folder entirely.

[safern]

Dang it, I should've searched for that 😄. Closing as a dupe then.