Tribes: "Tribal Government" form update for EMD

[CocoByte]

Issue description

Update the "Tribal Government" form in Domain Requests to match the new flow shown in this figma. Instead of just a text input field, provide a dropdown that allows users to select from a list of state and/or federal tribes. The state and federal tribes are pulled from the "federal tribes" and "state tribes" tables via the service layer created in #5293.

NOTE: Ignore all delta symbol related components in this ticket. The delta symbol messaging and delta markings in the dropdown list will be implemented in a follow-on ticket.

Acceptance criteria

• Update the "Tribal Government" form in Domain Requests to provide a dropdown as shown in this figma.
• Utilize the service layer from Tribes: Create Tribal Service Layer #5293 for obtaining data for the dropdown

Additional context

No response

Links to other issues

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