Correctly calculate wetted perimeter when components have depletable flags

[mgjarrett]

What is the change?

Update the method Block.getWettedPerimeter() to correctly find components whether or not they have Flags.DEPLETABLE.

This is kind of an ugly implementation, but that's a result of using Flags to mark components as depletable. The Flags system probably shouldn't be used for this purpose; it would be preferable if there was a depletable property of components separate from the flags system (e.g., like name or spatialGrid)

Why is the change being made?

Sometimes the same components that define the wetted perimeter of a block will also be marked as depletable. We want to be able to run TH calculations that need to calculate the wetted perimeter at the same time as the depletion calculations..

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify any new/changed code.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes have been updated if necessary.
• The documentation is still up-to-date in the doc folder.
• The dependencies are still up-to-date in pyproject.toml.