Fix Liquibase diff when JPA entities not modified

[Tristan-WorkGH]

Liquibase diff generate changes when using main branch without modifying JPA entities.

• The diff is from Dynamic Simulation - Change relation between ModelVariableSetEntity and ModelVariableDefinitionEntity from Composition to Aggregation #61 and Dynamic Simulation - Database - Rework on model's parameter definitions #65, where the links @OneToMany was changed to @ManyToMany between
  • model_variable_sets.variable_set_name ↔ model_variable_definitions.variable_definition_name
  • models.model_name ↔ model_parameter_definitions.parameter_definition_name
  • models.model_name ↔ model_variable_definitions.variable_definition_name
• Also add missing compatibility mode in H2 configuration
• ⚠️ need release v18 of Fix Liquibase configuration (diff when JPA entities not modified) powsybl/powsybl-parent#54