[mono] Add a no-exec code manager for AOT compilation; switch Catalyst CI to JustInte...

[mono] Add a no-exec code manager for AOT compilation; switch Catalyst CI to JustInterp AOT mode (#53197)

* Initial pass at trying to run catalyst in aot interp only mode

* Cleanup

* Remove yml dup

* Incorporate changes and identify native libraries to skip during System.Diagnostics.FileVersionInfo test run

* [mini] Add a no-exec code manager for AOT compilation

   Don't allocate pages with execute permission if we're never going to be executing code.  Also don't try to toggle per-thread write protection if we're not expecting to write to executable pages.

* also set no_exec earlier and create the ALC codeman with noexec

* Don't assert on Catalyst in mono_codeman_enable_write

   We defensively also toggle the page write protect bits when resolving some AOT patch targets in mono_resolve_patch_target_ext.  Instead allow the call, but don't do anything.

* Set ENABLE_MONOTOUCH for MacCatalyst arm64.  Define MONOTOUCH in one place

* [aot] mscorlib.dll isn't CoreLib on netcore

   It's a forwarding assembly.  Don't treat it specially

* [testing] In JustInterp mode, only AOT System.Private.CoreLib

   We only need to AOT the trampolines in System.Private.CoreLib in interpreter-only mode.  We don't need to AOT any of the user code in other assemblies.

   Side effect: fixes the System.Runtime.Loader.DefaultContext testsuite in JustInterp mode.  Still broken in Full AOT mode. (That testsuite references the System.Runtime.Loader.Noop.Assembly assembly, but with a different filename
System.Runtime.Loader.Noop.Assembly_test.dll which causes linking errors due to incorrect symbols in AOT module registration in AppleAppBuilder)

* Update iOS sample to use JustInterp

   and adhoc signing

* Don't run iOS sample on the CI build machine

* Disable some tests

Fixes https://github.com/dotnet/runtime/issues/53106

Co-authored-by: Steve Pfister <steve.pfister@microsoft.com>
Co-authored-by: Steve Pfister <steve@Steves-M1.fios-router.home>