CI check to make sure that all libraries have their source code verified

[daniellehrner]

PR description

Adds a new check to the CI that verifies that all libraries that are added to Gradle have their sources verification entries added as well. Reuses logic from the existing resolveSourceArtifacts Gradle task that is adding those sources.

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• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
• hive tests: Engine or other RPCs modified?

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a CI gate to ensure Gradle dependency verification metadata includes corresponding source artifact entries for resolved external dependencies, reusing the existing source-resolution logic.

Changes:

• Refactors source-artifact collection/resolution into reusable ext closures in build.gradle.
• Adds a new verifySourceArtifacts Gradle task that fails if gradle/verification-metadata.xml lacks source entries.
• Wires the new verification task into the GitHub Actions pre-review workflow as a required job.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
build.gradle	Extracts shared dependency/source resolution logic and adds verifySourceArtifacts to validate verification metadata coverage.
.github/workflows/pre-review.yml	Adds a new CI job that runs ./gradlew verifySourceArtifacts and gates the “unittests-passed” aggregator on it.