Speed up carthage installation tests (#4184)

Speeds up carthage installation tests by reducing the amount of work
that they do.

It almost halves the execution time:

| Before | After |
| :-: | :-: |
| <img width="812" alt="Screenshot 2024-08-14 at 12 05 07 PM"
src="https://github.com/user-attachments/assets/5d124805-feaa-46e4-b35a-a5ce1e30e0e1">
| <img width="512" alt="Screenshot 2024-08-14 at 12 30 54 PM"
src="https://github.com/user-attachments/assets/535d2792-ae8c-4a1c-8158-c75f90f487c3">
|

Tests/InstallationTests/CarthageInstallation/fastlane/Fastfile

@@ -13,9 +13,11 @@ lane :installation_tests do
 
   Dir.chdir("..") do
     # install without building, then remove the tests and build, so that carthage
-    # doesn't try to build the other installation tests
+    # doesn't try to build the other installation tests and testing apps
     sh "carthage", "update", "--no-build"
     sh "rm", "-rf", "Carthage/Checkouts/purchases-root/Tests/InstallationTests/"
+    sh "rm", "-rf", "Carthage/Checkouts/purchases-root/Tests/APITesters/"
+    sh "rm", "-rf", "Carthage/Checkouts/purchases-root/Tests/TestingApps/"
 
     # Carthage builds all schemes including ones we don't need, so let's nuke them before proceeding
     schemes_directory = "Carthage/Checkouts/purchases-root/RevenueCat.xcodeproj/xcshareddata/xcschemes"