ci: check with all features

[roderickvd]

Ensure the following all work out of the box - assuming availability of system libraries:

1. Compiling with default features
2. Compiling with no default features (equal to item 1; so removed to save the CI effort)
3. Compiling with all features

[Copilot]

Pull request overview

This PR updates the platform CI workflow to validate that cpal compiles and tests successfully with default features and with all features enabled, while removing redundant --no-default-features runs (since default = []).

Changes:

• Remove --no-default-features test/check steps across multiple jobs to reduce CI work.
• Ensure “all features” builds are covered across platforms, including adding/expanding checks for the WebAssembly jobs.
• Add missing “default features” example checks in the wasm jobs for baseline parity.

Comments suppressed due to low confidence (1)

.github/workflows/platforms.yml:152

• In the linux-armv7 job, the step labeled “Check examples (all features)” is actually running cross ... test and doesn’t pass --examples, so it won’t check example compilation at all. Also, both steps are labeled “all features” but only enable jack,pulseaudio, which is misleading in CI output.

      - name: Run tests (all features)
        run: cross +${{ steps.msrv.outputs.all-features }} test --features=jack,pulseaudio --workspace --verbose --target ${{ env.TARGET }}

      - name: Check examples (all features)
        run: cross +${{ steps.msrv.outputs.all-features }} test --features=jack,pulseaudio --workspace --verbose --target ${{ env.TARGET }}

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