Add liquibase script for swatch-contracts test

PR #3237 introduced the SPECIAL_PRICING_FLAG to the offering table for the monolith, but we need to add a liquibase script specific for h2 databases so swatch-contracts integration test will be successful

Resolves exception

```
Caused by: org.hibernate.exception.SQLGrammarException: could not prepare statement [Column "SPECIAL_PRICING_FLAG" not found; SQL statement:
insert into offering (cores,derived_sku,description,has_unlimited_usage,hypervisor_cores,hypervisor_sockets,metered,product_family,product_name,role,sla,sockets,special_pricing_flag,usage,sku) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?) [42122-224]] [insert into offering (cores,derived_sku,description,has_unlimited_usage,hypervisor_cores,hypervisor_sockets,metered,product_family,product_name,role,sla,sockets,special_pricing_flag,usage,sku) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)]
```

swatch-contracts/src/main/resources/db/202405222240_add_offering_special_product_tag_h2_only.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<databaseChangeLog
+  xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.20.xsd">
+  <changeSet id="202405222240-01" author="lburnett" dbms="h2">
+    <comment>Add SPECIAL_PRICING_FLAG column to the OFFERING table for tests only (since it is still
+      managed by the
+      monolith)
+    </comment>
+    <addColumn tableName="offering">
+      <column name="special_pricing_flag" type="VARCHAR(255)"/>
+    </addColumn>
+    <rollback>
+      <dropColumn tableName="offering" columnName="special_pricing_flag"/>
+    </rollback>
+  </changeSet>
+</databaseChangeLog>
+
+
+  <!-- vim: set expandtab sts=4 sw=4 ai: -->
+

swatch-contracts/src/main/resources/db/changeLog.xml

@@ -15,5 +15,5 @@
   <include file="db/202402151611_add_offering_sku_product_tag_h2_only.xml"/>
   <include file="db/202402161401_fix_contract_product_for_rosa.xml"/>
   <include file="db/202405031420_terminate_azure_testing_subscriptions.xml"/>
-
+  <include file="db/202405222240_add_offering_special_product_tag_h2_only.xml"/>
 </databaseChangeLog>