Temporarily disable code coverage test for circleCI

[RazvanN7]

[dlang-bot]

Thanks for your pull request and interest in making D better, @RazvanN7! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
• My PR is as minimal as possible (smaller, focused PRs are easier to review than big ones)
• I have provided a detailed rationale explaining my changes
• New or modified functions have Ddoc comments (with Params: and Returns:)

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If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#15128"

[RazvanN7]

cc @dkorpel

[PetarKirov]

CircleCI is finally green 🎉
Only macOS and GDC left to go fully green!
@RazvanN7 go ahead and merge manually and please open a Bugzilla ticket as a reminder to fix the codecov issue eventually.

[RazvanN7]

https://issues.dlang.org/show_bug.cgi?id=23860