Honour the global-level 'run: once' setting in an included Taskfile

[jlucktay]

Given two Taskfiles in a project: one at the root and the other in a subdirectory.
If the subdirectory Taskfile has run: once set at the global/top level (rather than set explicitly per-task) and the root Taskfile includes the subdirectory Taskfile, the task calls from the root directory can potentially run the subdirectory Taskfile tasks more than once.

/Taskfile.yaml:

version: '3'

includes:
  subdir: ./subdir/Taskfile.yaml

tasks:
  reproduce:
    deps:
      - task: subdir:once-only
      - task: subdir:once-only

/subdir/Taskfile.yaml:

version: '3'

run: once

tasks:
  once-only:
    cmd: echo "Once"

  several:
    deps:
      - task: once-only
      - task: once-only
      - task: once-only

From inside the subdirectory, run: once works fine:

$ cd subdir
$ task several
task: [once-only] echo "Once"
Once

From the root directory, the subdirectory Taskfile's run: once setting has no effect:

$ task reproduce
task: [subdir:once-only] echo "Once"
task: [subdir:once-only] echo "Once"
Once
Once

---

These other issues/PRs seem similar/relevant, but distinct from this particular situation:

• Make run:once work for dependencies shared amongst included taskfiles #852
• feat: directed acyclic graph (DAG) #1563
• fix: run once in shared dependencies #1655