In `cmGlobalVisualStudio7Generator::WriteTargetsToSolution`, we skip
writing `ZERO_CHECK.proj` to solution file as the check in
`cmGlobalVisualStudioGenerator::IsInSolution` returns `false` for
`ZERO_CHECK`. However, we write ZERO_CHECK to ProjectDependencies for
external projects as there are no checks in
`cmGlobalVisualStudio71Generator::WriteExternalProject`.
Similar to `cmGlobalVisualStudioGenerator::IsInSolution`, we introduce
`IsDepInSolution(const std::string&)` which excludes `ZERO_CHECK.proj`
from being added to sln file for the cases where we have `ZERO_CHECK.proj`.
Fixes: #23708
