Relationship field: filter on wrong field with defaultSort

[Janisvb]

Link to reproduction

https://github.com/Janisvb/payload-reproduction/tree/relationship-search

Describe the Bug

When defaultSort is set, the relationship field seems to filter on the defaultSearch-field rather than on the useAsTitle-field. This leads to errors, if the defaultSort-field is not a text-based field.

https://github.com/payloadcms/payload/assets/7983986/ee74eeee-d728-4def-a2ce-f509ac549f73

To Reproduce

yarn dev _community

Payload Version

2.8.1

Adapters and Plugins

db-postgres, bundler-webpack

[linobino1]

I'm just pushing here, I suppose this is a small thing but it makes the defaultSort property practically unusable.

[andershermansen]

I also got hit by this.

Seems defaultSort is used for fieldToSearch: https://github.com/payloadcms/payload/blob/9152a238d2982503e7f509350651b0ba3f83b1ec/packages/payload/src/admin/components/forms/field-types/Relationship/index.tsx#L149

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