InteractiveUtils.jl: fixes issue where subtypes resolves bindings and causes deprecation warnings

[dgleich]

The current version of subtypes will throw deprecation errors even if no one is using the deprecated bindings.

A similar bug was fixed in Aqua.jl - https://github.com/JuliaTesting/Aqua.jl/pull/89/files

See discussion here:

• ImageCore warning needs fixing (by using XRGB and RGBX) JuliaIO/ImageMagick.jl#235 (for identifying the problem)
• re-exported deprecated symbols not marked deprecated simonster/Reexport.jl#42 (for pointing to the issue in Aqua.jl)
• https://github.com/JuliaTesting/Aqua.jl/pull/89/files (for the fix in Aqua.jl)

This adds the isbindingresolved test to the subtypes function to avoid throwing deprecation warnings. It also adds a test to check that this doesn't happen.

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On the current master branch (before the fix), the added test shows:

WARNING: using deprecated binding InternalModule.MyOldType in OuterModule.
, use MyType instead.
Subtypes and deprecations: Test Failed at /home/dgleich/devextern/julia/usr/share/julia/stdlib/v1.12/Test/src/Test.jl:932
  Expression: isempty(stderr_content)
   Evaluated: isempty("WARNING: using deprecated binding InternalModule.MyOldType in OuterModule.\n, use MyType instead.\n")
Test Summary:             | Fail  Total  Time
Subtypes and deprecations |    1      1  2.8s
ERROR: LoadError: Some tests did not pass: 0 passed, 1 failed, 0 errored, 0 broken.
in expression starting at /home/dgleich/devextern/julia/stdlib/InteractiveUtils/test/runtests.jl:841
ERROR: Package InteractiveUtils errored during testing

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Using the results of this pull request:

@test_nowarn subtypes(Integer);

passes without error. The other tests pass too.