Consider adding a wrapper around `jasmine_node_test` rule

[AndrewKushnir]

PR angular/angular#44505 updated angular/angular repo to use ES2015 instead of ES5. The mentioned change revealed that there is a duplication in a lot of places where the bootstrap is defined, for example:

jasmine_node_test(
    bootstrap = ["//tools/testing:node_no_angular_es2015"],

or:

jasmine_node_test(
    bootstrap = ["//tools/testing:node_es2015"],

This makes further ES version upgrades quite error-prone (and time-consuming), since we need to change ~100 files.

The proposal is to create a couple wrappers, for example:

• ng_node_test
• no_ng_node_test

and specify bootstrap there by default (and allow overrides), so that it's easier to update ES version.