Not all internal builds need access to the secrets variable group

[lbussell]

The common pipeline variable template always references the secrets variable group. However, not every pipeline using the internal template needs this secrets variable group:

docker-tools/eng/common/templates/variables/dotnet/common.yml

Lines 50 to 52 in b115487

	- group: DotNet-Docker-Common
	- ${{ if eq(variables['System.TeamProject'], 'internal') }}:
	- group: DotNet-Docker-Secrets-WIF

We should find another way to condition this, so that we can exclude it for some pipelines such as cg-detection.yml.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.