target dependsOn should run chained targets synchronously

[drdreo]

I have a build chain dependency where build A, needs build B & C. But B must not be built before C is finished, since the output folder is only cleared in one build configuration - C. If the order is not followed, that could lead to a race condition before C completes and C could clean the folder, containing build B (which finished faster).

It would be great if the dependency targets listed in dependsOn are not only executed, but also awaited for completion in order.
Since this is not a bug, but likely to improve the total execution time, i could imagine a new option on a target, sync: true so that all targets listed are executed synchronously.

Example

Regardles of the dependency order in target asdf, the echo 2 is always done first.
I would expect to have the ping localhost do its thing (pinging for 4 seconds) and after that is completed, we can start log2 -- echo 2 is printed.

ping here is used to visualize a delay.

  "log1": {
      "executor": "nx:run-commands",
      "options": {
          "commands": ["ping localhost"]
      }
  },
  "log2": {
      "executor": "nx:run-commands",
      "options": {
          "commands": ["echo 2"]
      }
  },
  "asdf": {
      "dependsOn": [
          "log1",
          "log2"
      ],
      "command": "echo test"
  },