Add test to confirm regression of parsing chunked with no length (3.8.6/3.9.0b)

[bdraco]

What do these changes do?

This is to confirm the related issue home-assistant/core#101893 (and home-assistant/core#101913)

This regression affects 3.8.6 and 3.9.0b

I haven't figure out the source yet. It appears to be limited to the c parser.

This is a regression in llhttp. I don't have a solution, but I do have a test case: nodejs/llhttp#256

The failure is here: https://github.com/aio-libs/aiohttp/actions/runs/6502938416/job/17662729062?pr=7697

Are there changes in behavior for the user?

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[frenck]

Affects #7675

[Dreamsorcerer]

Looks like this one is redundant now.