[8.15] [Observability Onboarding] Fix Otel for x86_64 macs (#194915) (#…

…195104)

# Backport

This will backport the following commits from `main` to `8.15`:
- [[Observability Onboarding] Fix Otel for x86_64 macs
(#194915)](#194915)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Summary\r\n\r\nFixes #194872 by
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Co-authored-by: Joe Reuter <[email protected]>

x-pack/plugins/observability_solution/observability_onboarding/public/application/quickstart_flows/otel_logs/index.tsx

@@ -567,7 +567,7 @@ rm ./otel.yml && cp ./otel_samples/platformlogs_hostmetrics.yml ./otel.yml && mk
       id: 'mac',
       name: 'Mac',
       firstStepTitle: HOST_COMMAND,
-      content: `arch=$(if [[ $(arch) == "arm64" ]]; then echo "aarch64"; else echo $(arch); fi)
+      content: `arch=$(if [[ $(uname -m) == "arm64" ]]; then echo "aarch64"; else echo $(uname -m); fi)
 
 curl --output elastic-distro-${agentVersion}-darwin-$arch.tar.gz --url https://${AGENT_CDN_BASE_URL}/elastic-agent-${agentVersion}-darwin-$arch.tar.gz --proto '=https' --tlsv1.2 -fOL && mkdir -p "elastic-distro-${agentVersion}-darwin-$arch" && tar -xvf elastic-distro-${agentVersion}-darwin-$arch.tar.gz -C "elastic-distro-${agentVersion}-darwin-$arch" --strip-components=1 && cd elastic-distro-${agentVersion}-darwin-$arch