Add test for Utah state tax reform

[nikhilwoodruff]

We have an example of a state tax reform in Utah that we can use to test APIv1/2 performance that is particularly important:

{
  "gov.states.ut.tax.income.rate": {
    "2025-01-01.2100-12-31": 0.0455
  },
  "gov.states.ut.tax.income.credits.ctc.child_age_threshold[0].amount": {
    "2025-01-01.2100-12-31": false
  },
  "gov.states.ut.tax.income.credits.ctc.child_age_threshold[2].threshold": {
    "2025-01-01.2100-12-31": 5
  },
  "gov.states.ut.tax.income.credits.ss_benefits.phase_out.threshold.JOINT": {
    "2025-01-01.2100-12-31": 75000
  },
  "gov.states.ut.tax.income.credits.ss_benefits.phase_out.threshold.SINGLE": {
    "2025-01-01.2100-12-31": 45000
  },
  "gov.states.ut.tax.income.credits.ss_benefits.phase_out.threshold.SEPARATE": {
    "2025-01-01.2100-12-31": 37500
  },
  "gov.states.ut.tax.income.credits.ss_benefits.phase_out.threshold.SURVIVING_SPOUSE": {
    "2025-01-01.2100-12-31": 75000
  },
  "gov.states.ut.tax.income.credits.ss_benefits.phase_out.threshold.HEAD_OF_HOUSEHOLD": {
    "2025-01-01.2100-12-31": 75000
  }
}