[Autofill] Handle non-default union type, tag type configs in tests

This CL modifies test expectations to handle non-default combinations
of kAutofillAiNoTagTypes and kAutofillUnionTypesForAutofillAi

- Tag types enabled,  union types disabled: unsupported.
- Tag types disabled, union types enabled:  default behavior.
- Tag types disabled, union types disabled: addressed by this CL.
- Tag types enabled,  union types enabled:  addressed by this CL.

Bug: 432645177
Change-Id: I07596e05ed4858f284d6db4f3fb16132af1367a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6815498
Commit-Queue: Christoph Schwering <schwering@google.com>
Reviewed-by: Jan Keitel <jkeitel@google.com>
Cr-Commit-Position: refs/heads/main@{#1496288}