[abort-controller] ship shim d.ts

[jeremymeng]

Currently we are packing the following types

    "shims-public.d.ts",
    "types/src",
    "types/3.1",

Now that we have bundled d.ts from api-extractor, we should pack two shim files instead, one for latest and one for the down-leveled.

From Deya in #17986 (comment)

I agree on updating the files list. It includes all files under types in addition to a shim file, so I would suggest to keep the shim and remove types entries. Furthermore, export everything from the d.ts file created by the api extractor from the shim (see here for example). Actually since downlevel types is being used, you will need to have two such shims, one for < v3.6 and another for everything else (see here for example).

As part of this work, also improve consistency with other packages in the repo

• change sdk/core/abort-controller/tsconfig.json to have

  declarationDir": ".types",
  declarationDir": ".types/latest",

• adapt to the above changes in sdk/core/abort-controller/package.json and sdk/core/abort-controller/api-extractor.json

[github-actions]

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