Remove deprecated code for Micronaut 4

[sdelamo]

Per module tasks:

• Create a Mayor version branch
• Target that branch to 4.0.x by setting githubCoreBranch
• Remove deprecated code in that branch.
• Set micronaut version to 4.0.0-SNAPSHOT
• Set micronautTest version to 3.5.0
• Add snapshot repos where necessary (this might include dependencyResolutionManagement in settings.gradle, and make sure docs and testCodeCoverageReport tasks also work)
• use buildSrc scripts to expose snapshot repos to avoid unnecessary duplication

---

• Micronaut TOML
• Micronaut Elastic Search
• Micronaut JMX
• Micronaut Micrometer
• Micronaut GraphQL
• Micronaut GRPC
• Micronaut Jackson XML
• Micronaut JAX-RS
• Micronaut OpenAPI
• Micronaut Problem-JSON
• Micronaut Serialization
• Micronaut Microstream
• Micronaut Servlet
• Micronaut Spring
• Micronaut AOT
• Micronaut Gradle Plugin
• Micronaut Maven Plugin
• Micronaut AWS
• Micronaut Azure
• Micronaut Discovery Client
• Micronaut GCP
• Micronaut Kubernets
• Micronaut Oracle Cloud
• Micronaut Tracing
• Micronaut Data
• Micronaut Cassandra
• Micronaut MongoDB
• Micronaut Neo4j
• Micronaut R2DBC
• Micronaut Redis
• Micronaut SQL
• Micronaut Flyway
• Micronaut Liquibase
• Micronaut Groovy
• Micronaut Kotlin
• Micronuat JMS
• Micronaut Kafka
• Micronaut MQTT
• Micronaut NATS
• Micronaut RabbitMQ
• Micronaut ACME
• Micronaut Cache
• Micronaut Email
• Micronaut Hibernate Validator
• Micronaut ignite
• Micronaut Picocli
• Micronaut Security
• Micronaut Test
• Micronaut Reactor
• Micronaut RxJava2
• Micronaut RxJava3
• Micronaut Multi-tenancy
• Micronaut RSS
• Micronaut TOML
• Micronaut Views
• Micronaut Crac

[wetted]

See micronaut-projects/micronaut-neo4j#269

Micronaut-Neo4j is blocked by a Java17 compatible version (5.x) of neo4jj/neo4j-java-driver

[wetted]

@melix @alvarosanchez will handle the micronaut-gradle-plugin and micronaut-maven-plugin separately