GH-10083: Apply Nullability into dsl package

Related to: #10083

* Fix all the reported issues and IDE suggestions
* Also, improve Nullability in the `TailAdapterSpec` and couple DSL Specs in JDBC module
according to a new Nullability rules in the core `dsl` package

* * Make `IntegrationComponentSpec.id()` as not-null
* Fix all the affected classes to deal with not-null or ensure they provide not-null

Author: artembilan