Add validation tests for housing benefit

changelog_entry.yaml

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+- bump: minor
+   changes:
+     added:
+       - Add test cases for housing benefit

policyengine_uk/tests/policy/baseline/gov/dwp/pension_credit/housing_benefit.yaml

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+- name: Single person eligible for housing benefit
+  period: 2023
+  absolute_error_margin: 5
+  input:
+    age: 28
+    benunit_rent: 80*52
+    is_single_person: true
+    in_social_housing: true
+    housing_benefit_reported: true
+    working_tax_credit_reported: true
+    employment_income: 2000
+  output:
+    housing_benefit: 80*52
+- name: Single person not eligible for housing benefit
+  period: 2023
+  absolute_error_margin: 5
+  input:
+    age: 28
+    benunit_rent: 80*52
+    is_single_person: true
+    in_social_housing: false
+    housing_benefit_reported: 0
+    working_tax_credit_reported: false
+    employment_income: 2000
+  output:
+    housing_benefit: 0
+- name: Single person partial eligible for housing benefit
+  period: 2023
+  absolute_error_margin: 5
+  input:
+    age: 28
+    weekly_hours: 31
+    benunit_rent: 80*52
+    is_single_person: true
+    in_social_housing: true
+    is_household_head: true
+    housing_benefit_reported: true
+    working_tax_credit_reported: true
+    employment_income: 6000
+  output:
+    housing_benefit: 45.86*52
+- name: Lone parent with small earnings
+  period: 2023
+  absolute_error_margin: 5
+  input:
+    age: 26
+    benunit_rent: 80*52
+    is_lone_parent: true
+    tenure_type: RENT_FROM_COUNCIL
+    housing_benefit_reported: true
+    employment_income: 0
+  output:
+    housing_benefit: 80*52
+- name: Single person over pension age
+  period: 2023
+  input:
+    age: 68
+    gender: MALE
+    benunit_rent: 80*52
+    housing_benefit_reported: true
+    LHA_eligible: true
+    is_SP_age: true
+    is_single_person: true
+    pension_income: 200*52
+  output:
+    housing_benefit: 80*52