[Search] Connectors docker instruction step, attempt fixing code scan… (

elastic#201440)

## Summary

Should close elastic/kibana-team#1220

Escape backslashes as well, see:

### Checklist

Check the PR satisfies following conditions. 

### Verification

Verified manually that output command still works

Reviewers should verify this PR satisfies this list as well.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [x] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [x] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

Co-authored-by: Elastic Machine <[email protected]>

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/connector_detail/components/docker_instructions_step.tsx

@@ -58,7 +58,10 @@ export const DockerInstructionsStep: React.FC<DockerInstructionsStepProps> = ({
     host: elasticsearchUrl,
   });
 
-  const escapedConfigYamlContent = configYamlContent.replace(/"/g, '\\"').replace(/\$/g, '\\$');
+  const escapedConfigYamlContent = configYamlContent
+    .replace(/\\/g, '\\\\')
+    .replace(/"/g, '\\"')
+    .replace(/\$/g, '\\$');
 
   const createConfigCommand = `mkdir -p "$HOME/elastic-connectors" && echo "${escapedConfigYamlContent}" > "$HOME/elastic-connectors/config.yml"`;