Fix execute gradle task for examples

[Abacn]

The following error appears when running ./gradlew :examples:java:execute

* What went wrong:
A problem occurred evaluating script.
> Could not set unknown property 'preCommitRunners' for project ':examples:java' of type org.gradle.api.Project.

Please add a meaningful description for your change here

broken after #36255

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This PR refactors Gradle build scripts for Java examples by centralizing pre-commit runner configurations into a common Gradle file and removing duplicated code, addressing a breakage introduced by a prior change.

Highlights

• Intent: This pull request aims to fix a broken Gradle task for executing examples, which was introduced by a previous change (Fix Build Issues with Iceberg Upgrade #36255). The core issue seems to be related to how pre-commit runner configurations are defined and shared across example projects.
• Changes Summary: The primary change involves refactoring the definition of pre-commit runners and their associated configurations. Previously, this logic was duplicated in examples/java/build.gradle, examples/java/iceberg/build.gradle, and examples/java/sql/build.gradle. This PR moves this common configuration into examples/java/common.gradle and makes the runner lists (preCommitRunners, nonPreCommitRunners) accessible as project extensions (project.ext). Additionally, the execute task definition was removed from examples/java/sql/build.gradle, likely indicating it's now handled by the common script or is no longer needed in that specific context.
• Reviewer Activity Summary: No reviewer activity has been recorded yet for this pull request.

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[Abacn]

assign set of reviewers

[github-actions]

Assigning reviewers:

R: @robertwb for label java.

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[liferoad]

R: @tarun-google

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[tarun-google]

LGTM