Don't validate APIs for test projects

[Goooler]

Fixes

> Task :test-projects:build-class:apiCheck FAILED
Execution failed for task ':test-projects:build-class:apiCheck'.
> Expected file with API declarations 'paparazzi-gradle-plugin/src/test/projects/build-class/api/build-class.api' does not exist.
  Please ensure that ':apiDump' was executed in order to get an API dump to compare the build against

[colinmarsch]

When does this error happen? Just trying to figure out why this fix might be needed

[Goooler]

This happends due to running ./gradlew apiDump in IDEA, as the test projects are enabled in IDEA env

paparazzi/settings.gradle

Lines 37 to 40 in d2da4fd

	def isIdea = !(System.getProperty("idea.version") ?: "").isEmpty()
	if (isIdea) {
	includeTestProjectsIntoIDE()
	}

The test projects are disabled on CI, so apiCheck tasks never fail.

[jrodbx]

how about using

ignoredPackages += ["app.cash.paparazzi.plugin.test"]

instead? Helps us avoid another use of allprojects/subprojects to be tackled whenever isolated projects hits stable.

[Goooler]

Need to dump empty API files for these projects first.

[SimonMarquis]

ℹ️ BCV will be phased out in favor of a built-in setting in the KGP and is already available since Kotlin 2.2.0.
It might be a good idea to also migrate this (the update is trivial) if we also proceed to update the Kotlin version.
More details on https://kotlinlang.org/docs/whatsnew22.html#binary-compatibility-validation-included-in-kotlin-gradle-plugin

[geoff-powell]

@SimonMarquis made the same change here #2088 and its merged