Change mac builds to use coreclr

Call GetRequiredService when creating Workspace in order to get exception in case a service is missing

Assert if we make a blocking wait on a threadpool thread.

.editorconfig: Don't set indent_size for all files

This changes the Mac builds to use coreclr for running csc and vbc

Call GetRequiredService when creating Workspace in order to get exception in case a service is missing.

Don't copy a massive byte-array for fuzz testing

Clarify overflow checks

Roslyn has many different kinds of files in it, so it would be a lot of
work to try to assign appropriate indent_size values to all of them, and
would tend to get out of date; consequently, it's not a very good idea
to include indent_size in the [*] section.

One example that was wrong here is .json; .xml and .xsd were also
similarly afflicted. (And .xsd most certainly does not need any more
afflictions beyond those that were "designed" into it.)

Fix crash in generate constructor for C#
Fixes #6920

Local constant declarations can specify const multiple times

Refactor the code to use the equals expressions that evaluate the method call to Kind consistently (Issue #6005)

Disable all ErrorSquiggleProducerTests

Tidy up the InteractiveEvaluator