[whatwg/fetch] Use internalResponse at end of fetch handover (PR #1645)

This ensures that callers of `processResponseEndOfBody` and `processResponseConsumeBody` would receive the correct body and response without additional steps.

Closes #1512

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1645

-- Commit Summary --

  * Use internalResponse at end of fetch handover

-- File Changes --

    M fetch.bs (21)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1645.patch
https://github.com/whatwg/fetch/pull/1645.diff

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