Disable failing schema test on mono runtimes.

[eiriktsarpalis]

Even though this disables the impacted TestTypes_GeneratesExpectedJsonSchema test on mono runtimes which checks for syntactic equality, the TestTypes_SerializedValueMatchesGeneratedSchema which evaluates the schema still runs on all platforms.

Contributes to #103694.

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[vitek-karas]

Please let me know if I don't understand it correctly:

• We don't plan to "fix" this really - as per the discussion in [Apple][TvOS][JsonSchemaExporter] Generated schema does not match the expected specification #103694
  • We don't plan to fix the runtime (to start returning a specific order)
  • We don't plan to fix S.T.J since it did nothing wrong
  • We don't plan to fix the test as that is very difficult

If that is the case, then I'd say we should modify the test to simply not run on mono runtimes without an "ActiveIssue". Basically I'd like us to resolve this once and for all - thus resolving #103694, but then that means we should not have an "ActiveIssue" pointing to it in our tests.

[eiriktsarpalis]

To me it still feels like something that we should eventually be fixing, e.g. if we release a JsonSchema type that implements semantic equality hence ActiveIssue rather than skip.

[vitek-karas]

OK - I'll leave that up to you :-)

[eiriktsarpalis]

Thanks. Happy to create another issue if you think we should be looking at guaranteeing attribute ordering at the runtime level.