Copy resources for python_boostrap rules.

[valadez-abel]

This is an attempt to workaround symbolic link issues with windows remote execution for the python_boostrap_binary rules. With this change, #673, #674, and #675 no longer happen, and C++ compilation properly works.

There's previous art mentioning resources were copied before, in order to keep python happy:

buck2/prelude/filegroup.bzl

Lines 33 to 37 in fdac95c

	# It seems that buck1 always copies, and that's important for Python rules
	if ctx.attrs.copy:
	output = ctx.actions.copied_dir(ctx.label.name, srcs)
	else:
	output = ctx.actions.symlinked_dir(ctx.label.name, srcs)

I'm happy to make any revisions and improve this change.

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[JakobDegen]

I left some comments on the issues. While I don't fundamentally object to this, I'd like to understand what's different about your RE environment before proceeding