[Serverless] Exclude search connectors integration from serverless projects (#208772)

fixes https://github.com/elastic/search-team/issues/9171
## Summary

The connectors integration should be GA in ECH, but shouldn't be
available in serverless right now.

~~Prettier also triggered on these files based on our `.prettierrc`
rules, it looks like. Let me know if I should revert all the formatting
changes. There were mixed quotes in a few places, and some indentation
stuff in others.~~

I removed the prettier changes because they invited substantial
conflicts with all the whitespace changes.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [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)

### Identify risks

Does this PR introduce any risks? For example, consider risks like hard
to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [x] Changes serverless behavior, so I'm deploying a serverless search
project to smoke test

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

config/serverless.es.yml

@@ -43,6 +43,9 @@ xpack.fleet.internal.registry.excludePackages: [
 
   # Profiling integrations
   'profiler_agent',
+
+  # Search connectors
+  'elastic_connectors',
 ]
 
 ## Fine-tune the search solution feature privileges. Also, refer to `serverless.yml` for the project-agnostic overrides.

config/serverless.oblt.yml

@@ -189,6 +189,9 @@ xpack.fleet.internal.registry.excludePackages: [
 
     # Profiling integrations
     'profiler_agent',
+
+    # Search connectors
+    'elastic_connectors',
   ]
 
 ## Required for force installation of integration packages

config/serverless.security.yml

@@ -142,6 +142,9 @@ xpack.fleet.internal.registry.excludePackages: [
 
     # Unsupported in serverless
     'cloud_defend',
+
+    # Search connectors
+    'elastic_connectors',
   ]
 # fleet_server package installed to publish agent metrics
 xpack.fleet.packages: