OTel onboarding: Don't fail on folder existing already (elastic#188657)

The current snippet for Linux and Mac fails if it has been run in the
same working dir already, as the directory the collector is unpacked
into exists already and `mkdir` will fail. This PR adds the `-p` flag to
avoid this.

It also updates the snapshot.

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

@@ -72,7 +72,7 @@ export const OtelLogsPanel: React.FC = () => {
   } = useKibana<ObservabilityOnboardingAppServices>();
 
   const AGENT_CDN_BASE_URL = isServerless
-    ? 'snapshots.elastic.co/8.15.0-9bb1fcab/downloads/beats/elastic-agent'
+    ? 'snapshots.elastic.co/8.15.0-bc431a00/downloads/beats/elastic-agent'
     : 'artifacts.elastic.co/downloads/beats/elastic-agent';
   // TODO change once otel flow is shown on serverless
   // const agentVersion = isServerless ? setup?.elasticAgentVersion : stackVersion;
@@ -555,7 +555,7 @@ spec:
       firstStepTitle: HOST_COMMAND,
       content: `arch=$(if ([[ $(arch) == "arm" || $(arch) == "aarch64" ]]); then echo "arm64"; else echo $(arch); fi)
 
-curl --output elastic-distro-${agentVersion}-linux-$arch.tar.gz --url https://${AGENT_CDN_BASE_URL}/elastic-agent-${agentVersion}-linux-$arch.tar.gz --proto '=https' --tlsv1.2 -fOL && mkdir elastic-distro-${agentVersion}-linux-$arch && tar -xvf elastic-distro-${agentVersion}-linux-$arch.tar.gz -C "elastic-distro-${agentVersion}-linux-$arch" --strip-components=1 && cd elastic-distro-${agentVersion}-linux-$arch 
+curl --output elastic-distro-${agentVersion}-linux-$arch.tar.gz --url https://${AGENT_CDN_BASE_URL}/elastic-agent-${agentVersion}-linux-$arch.tar.gz --proto '=https' --tlsv1.2 -fOL && mkdir -p elastic-distro-${agentVersion}-linux-$arch && tar -xvf elastic-distro-${agentVersion}-linux-$arch.tar.gz -C "elastic-distro-${agentVersion}-linux-$arch" --strip-components=1 && cd elastic-distro-${agentVersion}-linux-$arch 
 
 sudo setcap 'cap_dac_read_search=ep' ./data/elastic-agent-*/elastic-agent
         
@@ -569,7 +569,7 @@ rm ./otel.yml && cp ./otel_samples/platformlogs_hostmetrics.yml ./otel.yml && mk
       firstStepTitle: HOST_COMMAND,
       content: `arch=$(if [[ $(arch) == "arm64" ]]; then echo "aarch64"; else echo $(arch); fi)
 
-curl --output elastic-distro-${agentVersion}-darwin-$arch.tar.gz --url https://${AGENT_CDN_BASE_URL}/elastic-agent-${agentVersion}-darwin-$arch.tar.gz --proto '=https' --tlsv1.2 -fOL && mkdir "elastic-distro-${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-$arch 
+curl --output elastic-distro-${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 
       
 rm ./otel.yml && cp ./otel_samples/platformlogs_hostmetrics.yml ./otel.yml && mkdir -p ./data/otelcol  && sed -i '' 's#\\\${env:STORAGE_DIR}#'"$PWD"/data/otelcol'#g' ./otel.yml && sed -i '' 's#\\\${env:ELASTIC_ENDPOINT}#${setup?.elasticsearchUrl}#g' ./otel.yml && sed -i '' 's/\\\${env:ELASTIC_API_KEY}/${apiKeyData?.apiKeyEncoded}/g' ./otel.yml`,
       start: './otelcol --config otel.yml',