[release/7.0] Target lower glibc for Linux arm64

[sbomer]

This uses new cross-build images, added in dotnet/dotnet-buildtools-prereqs-docker#754, that target Ubuntu 16.04. It should address the .NET 7 part of #69361.

Same change was made in .NET 8 here: #80939.

The new images were published here: dotnet/versions@33968c3
Updated to dotnet/versions@f2e8ed1.

Customer Impact

Allows .NET Linux arm64 to run on Amazon Linux 2 by lowering the glibc version requirement to 2.23. Fixes the .NET 7 part of #69361. Customers were hitting the following when using .NET Linux arm64 for AWS Lambda functions:

Failed to load /var/task/libcoreclr.so, error: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by /var/task/libcoreclr.so)

AWS tracking issue: aws/aws-lambda-dotnet#1310

Testing

• Ci testing
• Local validation that build succeeds with pgo instrumentation (using cross-compiled LLVM profiler library)
• Manual validation of glibc symbol versions in the native build output
• Handed a ci build to partners who validated it was working as expected for their scenarios on Amazon Linux 2 (see Define libc targeting plan #69361 (comment))
• Same fix was applied in .NET 8 and is rolling out as part of of preview 1

Risk

Low to medium. Any risk is limited to Linux arm64. This is a change in the version of a fundamental dependency, but testing gives confidence that the fix is functionally good. Building with PGO instrumentation has been validated. Collection of PGO data, and validation of the perf characteristics of PGO-optimized builds using the resulting data, has not been manually tested, but the fix has gone through the .NET 8 official build process successfully, suggesting that it passes any automated PGO validation we have.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[ghost]

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Issue Details

---

This uses new cross-build images, added in dotnet/dotnet-buildtools-prereqs-docker#754, that target Ubuntu 16.04. It should address the .NET 7 part of #69361.

The new images were published here: dotnet/versions@33968c3

Author:	sbomer
Assignees:	sbomer
Labels:	area-Infrastructure
Milestone:	-

[sbomer]

Currently hitting #81619 and #81545.

[jeffschwMSFT]

approved. we will take for consideration in 7.0.x. please get a code review

[carlossanlop]

Since this PR hit the failure due to not finding the ARM64 helix queue, I'm closing and reopening it now that I merged the fixes for those queues, to ensure we get the necessary coverage in the PR.

[carlossanlop]

Approved by Tactics for 7.0.4.
Signed off by area owners.
No OOB changes needed.
CI failures in re-run are pre-existing and unrelated: #81544 and #81391
Ready to merge.