Update config; migrate to new Spine APIs, Gradle 9 and JVM 17

[alexander-yevsyukov]

Summary

Updates the config submodule to the latest version and migrates the project to the new
build infrastructure and Spine 2.0 APIs. The three published libraries — web,
firebase-web, and testutil-web — build and test cleanly with ./gradlew clean build.

Published version: 2.0.0-SNAPSHOT.80.

Build infrastructure

• config submodule updated; buildSrc synced to the new dependency layout
  (io.spine.dependency.{lib,build,test,local,boms,kotlinx}).
• Gradle 9.5.1 (wrapper bump) and JVM 17 (required by the new Spine artifacts; was JVM 11).
• Root build.gradle.kts migrated to the new helpers: standardSpineSdkRepositories() /
  repositories.standardToSpineSdk(), forceVersions(), BomsPlugin, KoverConfig
  (was JacocoConfig), dokka-setup (was dokka-for-java), the protobuf/errorprone
  plugin accessors, the compilerOptions Kotlin DSL, and the updated
  spinePublishing / updateGitHubPages APIs.
• Version model moved to io.spine.dependency.local.* objects (CoreJvm.server,
  Base.lib, TestLib.lib, …); the per-artifact version extras were dropped from
  version.gradle.kts (only the spine-mc-js version remains as a string).
• Reconstructed dependency-conflict resolution (buildscript + per-project force lists for
  Jackson / Kotlin / gRPC / Spine); added the Google Cloud and OpenTelemetry BOMs to
  firebase-web to align the Firebase Admin SDK tree; added the JUnit Platform launcher
  (now required on the test runtime classpath under Gradle 9).
• Subproject code-generation plugin io.spine.mc-java → io.spine.core-jvm.

Source migrations

Consequences of the Spine version jump (.68 → .376/.4xx):

• io.spine.json.Json.{toCompactJson,fromJson} → io.spine.type.Json extensions
  (fromJson(json, cls) → fromJson(cls, json); it now throws IllegalStateException,
  which JsonMessageParser now handles so invalid input still yields HTTP 400).
• Logging fully migrated to Spine Logging (no Flogger): the old
  io.spine.logging.Logging mixin (_error()) → WithLogging + logger().atError();
  static loggers (FluentLogger.forEnclosingClass()) →
  io.spine.logging.LoggingFactory.forEnclosingClass().
• Test log capture SimpleLoggingTest → io.spine.testing.logging.LoggingTest; removed the
  now-ambiguous Truth8.assertThat (merged into Truth).
• Fixed JSpecify-migration typos (import import …, @NotNull → @NonNull).

Temporarily disabled — JS Protobuf tooling outage

Commented out in settings.gradle.kts until the tooling is compatible with the new config:

• client-js, js-tests — spine-mc-js is unresolvable: its spine-tool-base /
  spine-plugin-base closure was removed from the repositories and is binary-incompatible
  with the new tool-base, and protoc no longer ships a js built-in (it now needs the
  external protoc-gen-js plugin).
• test-app — gretty 3.0.6 references org.gradle.util.VersionNumber, a Gradle internal
  removed in Gradle 9.

Verification

./gradlew clean build is green — 83 tests pass (web 17, firebase-web 60,
testutil-web 6), along with PMD, Checkstyle, Kover, license reports, and POM generation.

Follow-ups

• Restore JS generation once a config-compatible spine-mc-js (and protoc-gen-js) is
  available, and upgrade gretty so test-app can return.
• Optional: replace the deprecated vBuild() calls with build() in firebase-web.

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