[Research] OUI Compliance audit of the `vis_default_editor` plugin

[BSFishy]

Tracking issue for OUI compliance audit of the vis_default_editor plugin.

Follow the steps in #3945 to complete the audit, then open another issue with findings. Once the work of performing the audit is done, this issue can be closed.

Related files

size (bytes) | file | notes ---|---|--- 2.4K | [src/plugins/vis_default_editor/public/_sidebar.scss](https://github.com/opensearch-project/OpenSearch-Dashboards/tree/main/src/plugins/vis_default_editor/public/_sidebar.scss) | 2.0K | [src/plugins/vis_default_editor/public/_default.scss](https://github.com/opensearch-project/OpenSearch-Dashboards/tree/main/src/plugins/vis_default_editor/public/_default.scss) | 223 | [src/plugins/vis_default_editor/public/_agg.scss](https://github.com/opensearch-project/OpenSearch-Dashboards/tree/main/src/plugins/vis_default_editor/public/_agg.scss) | 176 | [src/plugins/vis_default_editor/public/_agg_params.scss](https://github.com/opensearch-project/OpenSearch-Dashboards/tree/main/src/plugins/vis_default_editor/public/_agg_params.scss) | 152 | [src/plugins/vis_default_editor/public/index.scss](https://github.com/opensearch-project/OpenSearch-Dashboards/tree/main/src/plugins/vis_default_editor/public/index.scss) |

If this issue isn't already assigned to someone and you'd like to take on this work, please ping @BSFishy in the comments and I can assign it to you.

[joshuarrrr]

The styling

https://github.com/opensearch-project/OpenSearch-Dashboards/blob/fe1f1d18ea9b26ddb19ae805f676b6e09798b294/src/plugins/vis_default_editor/public/_sidebar.scss#L29-L35

affects a lot of visualizations (see https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4390)