Remove hard dependency on git CLI available to the build system.

[MicahZoltu]

Describe the bug
Previously, I could dotnet build ... on my machine without any problems. Now when I try I get the following error:

  ---> Generating Git Hash file Before Build
  'git' is not recognized as an internal or external command,
  operable program or batch file.
C:\...\src\Nethermind\Nethermind.Runner\Nethermind.Runner.csproj(119,5): error MSB3073: The command "git describe --tags --long --always > git-hash" exited with code 9009.

To Reproduce
Steps to reproduce the behavior:

1. Install Windows 11
2. Install dotnet SDK
3. Acquire Nethermind source code
4. cd src/Nethermind
5. dotnet build --configuration Release Nethermind.sln
6. Notice that the build fails

Expected behavior
I don't need any tooling besides dotnet to build.

Desktop (please complete the following information):

• OS: Windows
• Version: 1.12.8

Additional context
While I do have git installed, I don't have it on my path because I never use it from the CLI, I always use it from higher level tooling.

[LukaszRozmej]

Fixed in #7131