Support import into Eclipse 2022-06

Fix a few issues preventing clean project import into Eclipse 2022-06:

  - `buildSrc` need to limit module imports to prevent clashes
    with those in the gradle API jar.

  - The CLI app needs some classpath changes in order to allow
    compileOnly project dependencies to resolve.

  - `AbstractJpaAutoConfigurationTests` needs some minor refactoring
    in order for generic captures to work with the Eclipse compiler.

spring-boot-project/spring-boot-cli/build.gradle

@@ -1,5 +1,6 @@
 plugins {
 	id "java"
+	id "eclipse"
 	id "org.springframework.boot.deployed"
 	id "org.springframework.boot.conventions"
 	id "org.springframework.boot.integration-test"
@@ -11,10 +12,12 @@ configurations {
 	dependenciesBom
 	loader
 	testRepository
+	compileOnlyProject
+	compileClasspath.extendsFrom(compileOnlyProject)
 }
 
 dependencies {
-	compileOnly(project(":spring-boot-project:spring-boot"))
+	compileOnlyProject(project(":spring-boot-project:spring-boot"))
 	compileOnly("jakarta.servlet:jakarta.servlet-api")
 	compileOnly("org.apache.groovy:groovy-templates")
 	compileOnly("org.springframework:spring-web")
@@ -199,3 +202,6 @@ publishing {
 	}
 }
 
+eclipse.classpath { // https://github.com/eclipse/buildship/issues/939
+	plusConfigurations += [ configurations.compileOnlyProject ]
+}