Cleanup Gradle build

[shanman190]

Before this PR

The build was using some old patterns that aren't supported anymore preventing Gradle 8.x adoption.

After this PR

• Fixes the current Gradle build at least partially to be compatible with Gradle 8.x
• Improves the configuration phase by avoiding creating any tasks or resolving any dependencies
• There still remains an issue that can't be resolved as it's upstream in the Intellij plugin which is supposed to be fixed in 2.0 whenever it gets released. DependenciesDownloader eagerly resolves dependencies JetBrains/intellij-platform-gradle-plugin#1494

Possible downsides?

None.

[palantirtech]

Thanks for your interest in palantir/palantir-java-format, @shanman190! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[shanman190]

If you'd like to only see com.diffplug.spotless:spotless-plugin-gradle only defined once, a quick way to achieve this is by modifying the pluginClasspath configuration above to have an extendsFrom compileOnly.

[fawind]

Looks good! Thanks a bunch for the clean up!

[koppor]

@shanman190 Thank you again for the work.

• There still remains an issue that can't be resolved as it's upstream in the Intellij plugin which is supposed to be fixed in 2.0 whenever it gets released. DependenciesDownloader eagerly resolves dependencies JetBrains/intellij-platform-gradle-plugin#1494

I see that there is an early version of the 2.0 version of the plugin (https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-dependencies-extension.html). Can this be used in this project somehow?

[shanman190]

@koppor, it might. If this project is ok with the early access version, then I don't see any harm in trying it out though to prove that it does work.