Cache dynamic versions in documentation tests

[Goooler]

Gradle keeps a cache of dynamic version => resolved version (ie 2.+ => 2.3). By default, these cached values are kept for 24 hours, after which the cached entry is expired and the dynamic version is resolved again.

https://docs.gradle.org/current/kotlin-dsl/gradle/org.gradle.api.artifacts/-resolution-strategy/cache-dynamic-versions-for.html

Follow up #2155.

[Copilot]

Pull request overview

This PR follows up on #2155 by attempting to reduce repeated remote metadata lookups during documentTest runs when documentation snippets use dynamic dependency versions (<version> placeholders replaced with +).

Changes:

• Adds a settings.gradle snippet hook (gradle.beforeProject { ... }) to cache dynamic versions for 30 days for snippet builds.

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