Remove all Full Fx TFMs from SBRP

[MichaelSimons]

As part of #3014, all net4* TFMs are being trimmed from source-build. Once this work is completed, we expect a significant number of SBRPs will no longer be referenced and therefore will be removed. Of the remaining SBRPs, we expect there will be some that target net4* and net core TFMs. Because of this, we would still need to have the net4* targeting packs in SBRP which is not desirable.

In order to address this problem, the generate SBRP tooling will need to be updated to filter out the net4* TFMs. We can then regenerate the existing packages that reference net4* TFMs in order to "clean them up".

Full Fx TFMs to remove

• net45 - Remove all net45 artifacts source-build-reference-packages#598
• net451 - Remove all net451 references source-build-reference-packages#596
• net46
• net461
• net462
• net47
• net472

[ViktorHofer]

With the new reference source package generator that should be possible by adding the following here: net4*.

[MichaelSimons]

All net 4* tfms have been removed now.

[ViktorHofer]

Congratulations - great milestone 👍