Don't include androidTest information about projects if it's not enabled

[ZacSweers]

This avoids a bug in skippy where we'd mistakenly mark an project as affected in android tests even if it wasn't actually enabled

[github-actions]

1. Remove unnecessary nested if statements and combine conditions to improve code readability and reduce nesting.
2. Extract the check for whether Android test is enabled into a separate variable to improve code clarity.
3. Move the logging and task configuration code inside the if block to avoid unnecessary execution when Android test is not enabled.
4. Use the is operator to check if the variant is of type HasAndroidTest instead of checking if variant.androidTest is not null.
5. Use a more descriptive variable name for the isAndroidTestEnabled variable.
6. Use a more descriptive variable name for the reason variable.
7. Use string interpolation instead of concatenation for the log variable.

Here's the updated code with the suggested changes:

internal class StandardProjectConfigurations(
  // ...
) {
  // ...

  val isAndroidTestEnabled = variant is HasAndroidTest && variant.androidTest != null
  if (isAndroidTestEnabled) {
    val excluded = slackExtension.androidHandler.featuresHandler.androidTestExcludeFromFladle.getOrElse(false)
    val isAffectedProject = computeAffectedProjectsTask.isEnabled && computeAffectedProjectsTask.isAffected(projectPath)

    if (!excluded && isAffectedProject) {
      computeAffectedProjectsTask.configure { androidTestProjects.add(projectPath) }
      if (isLibraryVariant) {
        (variant as LibraryVariant).androidTest?.artifacts?.get(SingleArtifact.APK)?.let { apkArtifactsDir ->
          // Wire this up to the aggregator
          androidTestApksAggregator.configure { androidTestApkDirs.from(apkArtifactsDir) }
        }
      }
    } else {
      val reason = if (excluded) "excluded" else "not affected"
      val taskPath = "${projectPath}:androidTest"
      val log = "$LOG Skipping $taskPath because it is $reason."
      slackTools.logAvoidedTask(AndroidTestApksTask.NAME, taskPath)
      if (slackProperties.debug) {
        project.logger.lifecycle(log)
      } else {
        project.logger.debug(log)
      }
    }
  }
}

By making these changes, the code becomes more readable and easier to understand. The logic is simplified and unnecessary nesting is removed. Variable names are more descriptive, making the code easier to follow.