Revert "Normalize RepoRoot to include trailing slash (#7498)"

[riarenas]

This reverts commit a419173.

fixes #7506

To double check:

• The right tests are in and and the right validation has happened. Guidance: https://github.com/dotnet/core-eng/tree/master/Documentation/Validation

[ghost]

Hello @riarenas!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

Do note that I've been instructed to only help merge pull requests of this repository that have been opened for at least 12 minutes. No worries though, I will be back when the time is right! 😉

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[ViktorHofer]

I have the fix ready, if you give me another few minutes I can submit the PR.

[riarenas]

@ViktorHofer sounds good. we can hold on on the revert:

@msftbot do not merge unless @ViktorHofer approves.

[riarenas]

I'm not sure the auto merge bot understands it shouldn't merge this anymore, so closing for now.

[ViktorHofer]

PR is up: #7508