Enable terragrunt run-all apply without using Atlantis project flag

[talesrc]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story

As a developer, I'd like to run terragrunt run-all apply without specifying the Atlantis project flag across multiple Atlantis projects. Each of my projects would have multiple modules, and as a result, the plan would be saved in the .terragrunt-cache folder of each module, not having the $PLANFILE created.

Currently, I've worked around this use-case by creating an empty $PLANFILE to trigger the project apply.

Atlantis version: v0.32.0

Describe the solution you'd like

The solution could be to set an attribute which would dynamic find the plans with a given name, something like running a find -type f -name "{plan-file-name}", which has the capability to find the files only within the Atlantis project folder.

Describe the drawbacks of your solution

As each Atlantis project is going to have zero or more plans, the Conftest usage would need to also be refactored to support multiple plans.

Describe alternatives you've considered

• Refactoring our IaC structure to create an individual Atlantis project for each module wouldn't be practical, as it would disrupt the relationships between modules and could result in unexpected behavior.

• Keep using with the workaround, with an empty plan file to trigger the apply, will not work when we start to use Conftest.