🔥 Remove the manual gradle installation

While investigating the issues with SSL errors, I discovered that cordova
doesn't use the system gradle, but configures `build.gradle` so that the
correct version of gradle is downloaded and installed on the first run.

This means that we don't need to install gradle manually, which in turn, means
that we don't need to install sdkman so that we install the pinned version of
gradle.

Yay for simplifying code and removing dependencies!
e-mission/e-mission-docs#1079 (comment)

setup/activate_native.sh

@@ -10,9 +10,6 @@ then
     echo "ANDROID_HOME and ANDROID_SDK_ROOT not set, android SDK not found"
 fi
 
-echo "Activating sdkman, and by default, gradle"
-source ~/.sdkman/bin/sdkman-init.sh
-
 echo "Ensuring that we use the most recent version of the command line tools"
 export PATH=$ANDROID_SDK_ROOT/cmdline-tools/latest/bin:$ANDROID_SDK_ROOT/emulator:$PATH
 

setup/export_shared_dep_versions.sh

@@ -7,7 +7,6 @@ export NPM_VERSION=10.8.2
 # Looks like brew supports only major and minor, not patch version
 export RUBY_VERSION=3.0
 export COCOAPODS_VERSION=1.15.2
-export GRADLE_VERSION=8.10
 export OSX_EXP_VERSION=12
 
 export NVM_DIR="$HOME/.nvm"

setup/setup_android_native.sh

@@ -27,19 +27,4 @@ else
     echo "ANDROID_HOME = $ANDROID_HOME; ANDROID_SDK_ROOT=$ANDROID_SDK_ROOT"
 fi
 
-echo "Setting up sdkman"
-curl -s "https://get.sdkman.io" | bash
-source ~/.sdkman/bin/sdkman-init.sh
-
-CURR_GRADLE_VER=`sdk current gradle | cut -d " " -f 4 | xargs`
-
-echo "CURR_GRADLE_VER = '$CURR_GRADLE_VER', expected $GRADLE_VERSION"
-
-if [[ $CURR_GRADLE_VER == $GRADLE_VERSION ]]; then
-    echo "Already have gradle version $GRADLE_VERSION"
-else
-    echo "Setting up gradle using SDKMan"
-    sdk install gradle $GRADLE_VERSION
-fi
-
 source setup/setup_shared_native.sh