Use native gRPC starter libraries from Spring Boot 4.1.1

Description

Depends on issue #1150.

Both cloud-functions and cloud-tasks expose gRPC endpoints. Currently, we use old gRPC libraries and plugins for code generation and gRPC support. Spring Boot 4.1.1 provides native first-class support for implementing gRPC servers effectively replacing the need for third-party starters like net.devh that we use currently.

Definition of Done

• Core tests must pass
• Apps should start successfully using local
• Apps should work in both self-hosted and managed environments
• Remove dependency on net.devh and older plugins/libraries

Resources (optional)

• https://docs.spring.io/spring-boot/reference/io/grpc.html

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