feat(@angular-devkit/build-angular): default to NodeJS value for pres…

[Toxicable]

…erveSymlinks

Under bazel preserveSymlinks would have to be set in two different places, this makes it so it only has to be set once by using the value from NodeJS if it's set.

[Toxicable]

Not sure if this is the right place to put this config, let me know if there's a better place to set it.

[clydin]

I’m ok with using it as a default. However, it would be a breaking change since the default would be different for some people. This could manifest in either broken builds or builds containing different dependencies than anticipated or expected. As a feature, this would probably fall into the v10 timeframe.

[Toxicable]

@clydin Sounds good to me, how would we make sure to come back and check this when there's a v10 branch?

[alan-agius4]

@Toxicable, I can create a v10 milestone and assign this Pr to it.

[alan-agius4]

Thanks Fabian! LGTM.

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