Add an option to not automatically add BOM

[melix]

This option has (at least) a couple use cases:

1. the issue described in Make it possible to allow users to define the Micronaut BOM (in order to achieve centralized version management) #681, when a user wants to drive the Micronaut version from a catalog, or directly in their dependencies (although this is probably redundant with Add a plugin to import the Micronaut Platform catalog #694)

2. we use the Gradle plugins in our module builds, where it's going to look for the platform BOM, which is not necessarily what we want, since we want to use local versions of projects and possibly override transitive versions

Closes #681

[melix]

Here's an example of how a Micronaut module build can be adapted to use this flag, on micronaut-rabbitmq:

diff --git a/buildSrc/src/main/groovy/io.micronaut.build.internal.rabbitmq-examples.gradle b/buildSrc/src/main/groovy/io.micronaut.build.internal.rabbitmq-examples.gradle
index d632e272..97e7fcfe 100644
--- a/buildSrc/src/main/groovy/io.micronaut.build.internal.rabbitmq-examples.gradle
+++ b/buildSrc/src/main/groovy/io.micronaut.build.internal.rabbitmq-examples.gradle
@@ -5,6 +5,9 @@ plugins {
 }
 
 dependencies {
+    micronautBoms(platform(mn.micronaut.core.bom))
+    micronautBoms(platform(mnTest.micronaut.test.bom))
+    micronautBoms(platform(mnTestResources.micronaut.test.resources.bom))
     testImplementation projects.micronautRabbitmq
     testImplementation mn.reactor
     testImplementation mnSerde.micronaut.serde.support
@@ -18,7 +21,8 @@ configurations.all {
     }
 }
 micronaut {
-    version libs.versions.micronaut.platform.get()
+    importMicronautPlatform = false
+    //version libs.versions.micronaut.platform.get()
     testRuntime "junit5"
     testResources {
         clientTimeout = 300
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index b421ff91..cd10d545 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,8 +1,9 @@
 [versions]
 micronaut-docs = '2.0.0'
 micronaut = '4.0.0-M2'
-micronaut-platform = '4.0.0-M1'
+#micronaut-platform = '4.0.0-M1'
 micronaut-test = '4.0.0-M1'
+micronaut-test-resources = '2.0.0-M1'
 micronaut-gradle-plugin = "4.0.0-M1"
 groovy = '4.0.10'
 spock = '2.3-groovy-4.0'
@@ -36,6 +37,7 @@ testcontainers-spock = { module = 'org.testcontainers:spock', version.ref = 'tes
 
 micronaut-micrometer = { module = "io.micronaut.micrometer:micronaut-micrometer-bom", version.ref = "micronaut-micrometer" }
 micronaut-serde = { module = "io.micronaut.serde:micronaut-serde-bom", version.ref = "micronaut-serde" }
+micronaut-test-resources = { module = "io.micronaut.testresources:micronaut-test-resources-bom", version.ref = "micronaut-test-resources" }
 gradle-micronaut = { module = "io.micronaut.gradle:micronaut-gradle-plugin", version.ref = "micronaut-gradle-plugin" }
 gradle-kotlin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 gradle-kotlin-allopen = { module = "org.jetbrains.kotlin:kotlin-allopen", version.ref = "kotlin" }
diff --git a/settings.gradle b/settings.gradle
index 4dbb2206..881afc18 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -26,4 +26,5 @@ micronautBuild {
     importMicronautCatalog()
     importMicronautCatalog("micronaut-micrometer")
     importMicronautCatalog("micronaut-serde")
+    importMicronautCatalog("micronaut-test-resources")
 }

Basically, the micronaut.platform solution has the advantage of being easy to setup, but you would still possibly add constraints which are not wanted when testing. By setting importMicronautPlatform to false, then the BOM is not applied anymore, so you have to explicitly import all the module BOMs that you are using, which provides correctness at the cost of simplicity.

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