Use CRLF for chunked response framing test

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Description

The chunked-response test generated bare-LF chunk delimiters, which the HTTP/1.1 parser now correctly rejects. Limit its framing data to CRLF while retaining chunk-size and read-path coverage.

• Chunk framing

  foreach (string lineEnding in new[] { "\r\n" })

• Scope
  Removes only invalid chunked framing; unrelated status-line and header LF coverage remains unchanged.

Customer Impact

Eliminates persistent outerloop failures across HTTP handler variants.

Regression

Test regression following strict CRLF enforcement for HTTP/1.1 chunked encoding.

Testing

The existing theory continues to cover both chunk-size ranges and synchronous/asynchronous stream consumption.

Risk

Low: test-data-only change aligned with RFC-compliant parser behavior.

Package authoring no longer needed in .NET 9

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Keep in mind that we still need package authoring in .NET 8 and older versions.

Note

This PR description was generated by GitHub Copilot.

• Fixes Test failure: GetAsync_Chunked_VaryingSizeChunks_ReceivedCorrectly fails with 'invalid chunk line ending' on all platforms (regression from #131138) #132121

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Pull request overview

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Suppressed comments (1)

src/libraries/Common/tests/System/Net/Http/HttpProtocolTests.cs:389

• GetAsync_Chunked_VaryingSizeChunks_ReceivedCorrectly_MemberData still loops over a single-value lineEnding array. Now that only CRLF is valid, consider simplifying the MemberData generation to remove the redundant loop and avoid implying multiple line endings are being exercised.

            foreach (int maxChunkSize in new[] { 1, 10_000 })
                foreach (string lineEnding in new[] { "\r\n" })
                    foreach (bool useCopyToAsync in new[] { false, true })
                        yield return new object[] { maxChunkSize, lineEnding, useCopyToAsync };

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