Recognize partial Options list results

## Summary

Options list controls now report when an Elasticsearch timeout or early-termination limit makes the available values incomplete. The control shows a Some values might be missing indicator, and edit mode points authors to the renamed Always load all results setting. The search-string query path now honors the same limits instead of bypassing terminate_after.

**Why this needs docs:** The change introduces a visible partial-results warning and renames a setting that the control settings reference currently names and describes differently.

## Resources

- PR [#283726](https://github.com/elastic/kibana/pull/283726) — [Controls] Improve `"Ignore timeout for results"` setting
- Product issue: https://github.com/elastic/kibana/issues/272688

## Availability

| Channel | Details |
|---------|---------|
| **Stack** | v9.6.0 |
| **Serverless** | Aug 17–Aug 21 |
| **Feature flag** | None — active by default |

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## Suggested edits

[Dashboard control settings](https://www.elastic.co/docs/explore-analyze/visualize/dashboard-control-settings) > Options list and range slider settings > Control settings
- **What the docs say:** The page calls the option Ignore timeout for results and says it waits to display results until the list is complete.
- **What to add:** Rename the option to Always load all results and explain the default tradeoff: large data sets can return a partial list quickly, the control marks that state with Some values might be missing, and enabling the option waits longer to return every valid value. Preserve the old label for earlier Stack versions with the lightest appropriate version-scoped wording. Applies from 9.6.0 and in serverless.