feat: env propagation for depends

[Its-Just-Nans]

Following #6342

Test

./e2e/run_test tasks/test_task_env_propagation_depends

[jdx]

I do not think this should be done

[Its-Just-Nans]

What's the reason?

[jdx]

I just don't think it makes sense that a task would inherit the env vars from a task it depends on

[jdx]

even if it did work I'd actually expect the relationship to go the other direction—really I don't think we should do this at all. Happy to hear you make a case for it but from this I don't think it's a good idea.

[Its-Just-Nans]

It was for a potential case like this

[tasks.build]
run = 'do build $BUILD_TYPE' # custom build command

[tasks.dev]
depends = ["build"]
env = { "BUILD_TYPE" = "dev" }

[tasks.deploy]
depends = ["build"]
env = { "BUILD_TYPE" = "production" }