TNS7 CLI pulls TNS 8 Templates, causing broken builds

[NathanaelA]

Environment

• CLI: 7.2.1

Describe the bug
If you do a tns create test (only tested js, ng, and vue -- probably happens with any flavor), it will pull the TNS 8 template which has the all new cool webpack config which unfortunately does not work with the webpack that TNS 7 is looking for as the cli passed to it is different.

Error reported is:

Preparing project...
[webpack-cli] Error: Unknown option '--env.externals=~/package.json'

To Reproduce
tns create test --js or tns create test --vue or tns create test --ng

Expected behavior
tns v7 should only pull a v7 template. (Tested: Tns v6 properly pulls only a v6 template).

Workaround
You can do a tns create test --template @nativescript/template-hello-world@7.0.4 to pull the latest 7.0 blank JS template. So if you lookup on npmjs you can find the latest 7.x template for tns7.