Add Exemption object to Ledger Specification

With this commit, we are starting to introduce the exemption object in the
Ledger specification so that it will be added to the TransactionView.

If an exemption was requested, the new object will be set with the property
`requested` set to true. If we know that an exemption was not requested, then
the new object will be set with the property `requested` set to false.

Further information in the JIRA ticket below.

https://payments-platform.atlassian.net/browse/PP-13332

.secrets.baseline

@@ -75,6 +75,10 @@
     {
       "path": "detect_secrets.filters.allowlist.is_line_allowlisted"
     },
+    {
+      "path": "detect_secrets.filters.common.is_baseline_file",
+      "filename": ".secrets.baseline"
+    },
     {
       "path": "detect_secrets.filters.common.is_ignored_due_to_verification_policies",
       "min_level": 2
@@ -121,14 +125,14 @@
         "filename": "openapi/ledger_spec.yaml",
         "hashed_secret": "9baeb3f7db14ddab5d172149762035c0c022d76d",
         "is_verified": false,
-        "line_number": 1644
+        "line_number": 1652
       },
       {
         "type": "Hex High Entropy String",
         "filename": "openapi/ledger_spec.yaml",
         "hashed_secret": "920734ed7628ef47739eed5571412e2c8271790f",
         "is_verified": false,
-        "line_number": 1718
+        "line_number": 1728
       }
     ],
     "src/main/java/uk/gov/pay/ledger/event/model/Event.java": [
@@ -159,5 +163,5 @@
       }
     ]
   },
-  "generated_at": "2024-07-22T11:29:46Z"
+  "generated_at": "2024-11-21T09:40:02Z"
 }

openapi/ledger_spec.yaml

@@ -1335,6 +1335,14 @@ components:
         wallet_type:
           type: string
           example: APPLE_PAY
+    Exemption:
+      type: object
+      properties:
+        requested:
+          type: boolean
+          description: It is set when the exemption has been requested or when we know that it has not been requested.
+          example: true
+          nullable: false
     ExternalTransactionState:
       type: object
       properties:
@@ -1655,6 +1663,8 @@ components:
         evidence_due_date:
           type: string
           format: date-time
+        exemption:
+          $ref: '#/components/schemas/Exemption'
         fee:
           type: integer
           format: int64