[WASMFS] Workaround for missing directory rename in OPFS

[rickg-hcl]

The origin private file system does not support directory rename. I don't know why.

This PR will implement a workaround for that that will only execute after the rename attempt throws an exception, so that if/when OPFS ever supports the move() method on a directory handle, it will be used instead of this workaround with no code change needed.

This is accomplished by creating new directories in the target, and moving the files into them, recursively.

One side effect is that the handle cache for the renamed directory will be cleared, since the file and directory handles will be different.

Fixes: #24162

I don't know how to fix the circleci failures that seem unrelated to this code change.

[sbc100]

Could you update the PR title and description with something a little more descriptive? Is there an open bug for this fix?

[rickg-hcl]

I updated the description. This is a "fix" for #24162 in that it works around the missing directory rename functionality in opfs.

[tlively]

Can you please update the PR description to describe the problem (e.g. the reason the backend does not already support directory renames) and the solution (e.g. what you are doing in the workaround and what limitations the approach might have)? That will help contextualize the code for review.