Migrate to IntelliJ Platform Gradle Plugin 2.0 RC

[Goooler]

https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin.html

[Goooler]

We can't remove this workaround yet.

Valkyrie/idea-plugin/build.gradle.kts

Lines 68 to 77 in fba80d2

	run {
	// workaround for https://youtrack.jetbrains.com/issue/IDEA-285839/Classpath-clash-when-using-coroutines-in-an-unbundled-IntelliJ-plugin
	buildPlugin {
	exclude { "coroutines" in it.name }
	archiveFileName = "${rootProject.name}-$version.zip"
	}
	prepareSandbox {
	exclude { "coroutines" in it.name }
	}
	}

[Goooler]

https://github.com/ComposeGears/Valkyrie/actions/runs/10053386801/job/27786217696

There is a signing-related error:

Execution failed for task ':idea-plugin:signPlugin'.
> No Marketplace ZIP Signer executable found.
  Please ensure the `zipSigner()` entry is present in the project dependencies section or `intellijPlatform.signing.cliPath` extension property
  See: https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-extension.html#intellijPlatform-signing

I'm trying to fix.

[Goooler]

Addressed to #46.