Add Windows 11 ARM to CI test matrix and simplify matrix infrastructure

[currantw]

Summary

Add Windows 11 ARM (windows-11-arm) to the full CI test profile, enabling build and unit test validation on aarch64-pc-windows-msvc. Integration tests are skipped because WSL2 is unavailable on GitHub's ARM Windows runner VMs (no nested virtualization). Also simplifies the CI matrix by lowercasing keys and removing redundant fields.

Issue Link

Closes #383.

Features and Behaviour Changes

• The windows-11-arm runner now participates in full CI profile.
• Unit tests run on all platforms; integration tests are skipped on aarch64-pc-windows-msvc.
• The test workflow now has separate "Unit tests" and "Integration tests" steps (previously a single combined step).
• CI matrix JSON keys are now lowercase for consistency.
• Removed unused ARCH and NAMED_OS matrix fields.
• Dead failure-reporting infrastructure removed (report-failures.yml, create_failures_json.sh).

Implementation

• Test split: The test-with-runners job now runs dotnet test tests/Valkey.Glide.UnitTests/ unconditionally, then runs dotnet test tests/Valkey.Glide.IntegrationTests/ gated on matrix.host.target != 'aarch64-pc-windows-msvc'. DNS configuration is inlined into the integration test step.
• install-shared-dependencies: WSL setup guard simplified to check target directly. Server installation skipped for aarch64-pc-windows-msvc.
• install-server: Removed os and target inputs. Uses runner.os for shell selection and WSL env passthrough. Cache key uses runner.os-runner.arch instead of the Rust target triple.
• Matrix keys: All keys lowercased (OS → os, RUNNER → runner, TARGET → target, IMAGE → image). load_matrices.py and cd.yml jq filter updated accordingly.

Limitations

• Integration tests cannot run on windows-11-arm due to the lack of WSL2/nested virtualization on GitHub's ARM Windows runner VMs. See Add Windows 11 arm64 to standard and full CI test matrix #383.
• Artifact names now use GitHub's capitalized runner.arch values (X64, ARM64) instead of the previous lowercase format.

Testing

• Test pipeline passes, including for Windows 11 runner.

Related Issues

• task(ci): CI/CD improvements (release 1.2) #389

Checklist

• This Pull Request is related to one issue.
• Commit message has a detailed description of what changed and why.
• Tests are added or updated and all checks pass. CI infrastructure change; no application tests to add.
• CHANGELOG.md, README.md, DEVELOPER.md, and other documentation files are updated.
• Destination branch is correct - main or release
• Create merge commit if merging release branch into main, squash otherwise.

[Copilot]

Pull request overview

Expands CI coverage by enabling Windows 11 ARM (windows-11-arm) in the standard/full test profiles and simplifies the matrix schema and related workflow plumbing. This also restructures the test workflow to run unit tests separately from integration tests, skipping integration tests on Windows ARM due to WSL limitations.

Changes:

• Add windows-11-arm to standard and full profiles; lowercase host matrix keys and remove redundant host fields.
• Split CI into separate unit/integration test steps and gate integration tests on non-Windows-ARM targets.
• Remove unused failure-reporting infrastructure and simplify server installation action inputs.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/Valkey.Glide.IntegrationTests/FlushDatabaseTests.cs	Makes cluster flush tests explicitly synchronous to avoid timing/flakiness.
.github/workflows/test.yml	Adds Windows ARM to matrix usage, lowercases matrix key references, and splits unit vs integration test execution (with ARM gating).
.github/workflows/scripts/create_failures_json.sh	Removes failure summary generation script (no longer used).
.github/workflows/report-failures.yml	Removes the dedicated “failure reporter” workflow.
.github/workflows/cd.yml	Updates jq filters and matrix key references to the new lowercase host schema.
.github/json_matrices/os-matrix.json	Lowercases host keys and includes windows-11-arm in standard/full profiles.
.github/json_matrices/load_matrices.py	Updates host/container detection for image key and fixes output formatting indentation.
.github/actions/install-shared-dependencies/action.yml	Adjusts WSL/server installation gating based on runner.os/runner.arch and removes redundant inputs passed to install-server.
.github/actions/install-server/action.yml	Removes os/target inputs and uses runner context for WSL/shell selection and cache keying.

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