Add switch to crossgen2 to ignore compile failures (dotnet/coreclr#26793)

Add switch to crossgen2 to ignore compile failures (dotnet/coreclr#26793)

* Add switch to crossgen2 to ignore compile failures
- the default failure behavior is good for most cases, but it is a problem when not actively working on codegen issues
- Method name printing is a risky process as it may throw. This changeset implements a ToString algorithm which attempts to print something even in the presence of errors

* Add back using statement removed in master branch

* Make ToString reslient to metadata loading failures
- Add a DiagnosticName property to type system constructs that have a Name property that may fail
- Workaround issue where Category cannot be reliably computed, and so instead use switch on type (as that is sufficient for this need)

* Switch to --resilient for switch name, and remove separate resilient name computation

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Commit migrated from https://github.com/dotnet/coreclr/commit/17f687ecf74eedd1ca80b2649381b8207178ba91