`tns run android` appends to .bash_profile/.zprofile even if denied for local build configuration

Environment

• CLI: 6.1.2
• Cross-platform modules: 6.0.7
• Android Runtime: 6.1.2
• iOS Runtime: 6.1.1
• Plugin(s): -

Describe the bug
When running tns run android and if the environment is not properly set up, the automatic environment setup script for a local build will automatically append JAVA_HOME and ANDROID_HOME, as well as ANDROID_SDK_ROOT to .bash_profile / .zprofile even if install steps 3 and 4 are rejected.

This happens every time the installer is run up to these steps which leads to a spammed .bash_profile / .zprofile if the installer needs to be aborted or restarted a couple of times. This will also overwrite previously set variables.

The output of the cli is as follows:

Step 3 of 12:
Allow the script to install Open JDK 8?
(Y)es/(N)o
n
You have chosen not to install Open JDK 8. Some features of NativeScript may not work correctly if you haven't already installed it
Set JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
Step 4 of 12:
Allow the script to install Android SDK?
Note that if you type all you won't be prompted for subsequent installations
(Y)es/(N)o/(A)ll
n
You have chosen not to install Android SDK. Some features of NativeScript may not work correctly if you haven't already installed it
Set ANDROID_HOME=/usr/local/share/android-sdk
Set ANDROID_SDK_ROOT=/usr/local/share/android-sdk
Configuring your system for Android development... This might take some time, please, be patient.
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration
zsh:1: no such file or directory: /usr/local/share/android-sdk/tools/bin/sdkmanager
WARNING: There seem to be some problems with the Android configuration

To Reproduce

1. Have an incomplete environment set up (e.g. do not have ANDROID_HOME as environment variable set)
2. run tns run android in your project
3. choose configure local build
4. deny all steps 3 and 4
5. check .bashprofile / .zprofile

Expected behavior
Have the setup script not append variables in .bashprofile / .zprofile or replace the variables if installation steps 3 and 4 are rejected.

Additional context
My .bash_profile after I had to retry the installer a couple of times:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Ho$
export ANDROID_HOME=/usr/local/share/android-sdk
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk

从 tns run android CLI 流程和 configure local build 使用的自动环境设置开始；在拒绝步骤 3 和 4 的情况下复现提示序列。跟踪 JAVA_HOME、ANDROID_HOME 和 ANDROID_SDK_ROOT 何时被写入 .bash_profile 或 .zprofile。完成标准是，被拒绝的安装步骤不会追加或替换这些变量，包括在重复重试之后。