Big-endian fixes: binary data in RenderBatch

[uweigand]

• Use little-endian accessors for RenderBatch binary data throughout

• Fixes part 3 of Big-endian platforms not supported #35709

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PR Title
Big-endian fixes: binary data in RenderBatch

PR Description

• Use little-endian accessors for RenderBatch binary data throughout
• Fixes part 3 of Big-endian platforms not supported #35709

[mkArtakMSFT]

Thanks for your contribution. @SteveSandersonMS can you please review this? Thanks!

[SteveSandersonMS]

Thanks!

Just FYI, we are going to remove Ignitor entirely soon, as it's now replaced by a more complete set of E2E tests. But in the meantime we can merge your change to it in case it helps you, since it doesn't seem to have any drawbacks for anyone else.

[uweigand]

Thanks, @SteveSandersonMS! Could this also go into the .NET 6 branch to fix the test suite failures on s390x there?

[SteveSandersonMS]

/backport to release/6.0

[github-actions]

Started backporting to release/6.0: https://github.com/dotnet/aspnetcore/actions/runs/1209108231