ignore_dangling_symlinks in shutil.copytree does not apply recursively

[veaviticus]

BPO	38523
Nosy	@ZackerySpytz, @veaviticus
PRs	bpo-38523: ignore_dangling_symlinks does not apply recursively #22937

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-10-18.22:29:15.013>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'ignore_dangling_symlinks in shutil.copytree does not apply recursively'
updated_at = <Date 2021-12-06.20:33:30.942>
user = 'https://github.com/veaviticus'

bugs.python.org fields:

activity = <Date 2021-12-06.20:33:30.942>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-10-18.22:29:15.013>
creator = 'veaviticus'
dependencies = []
files = []
hgrepos = []
issue_num = 38523
keywords = ['patch']
message_count = 1.0
messages = ['354924']
nosy_count = 2.0
nosy_names = ['ZackerySpytz', 'veaviticus']
pr_nums = ['22937']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38523'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[veaviticus]

The ignore_dangling_symlinks attribute in shutil.copytree is not passed down recursively, resulting in dangling symlinks located anywhere other than the root of the source tree to raise an error.

The line causing the error for 3.9: https://github.com/python/cpython/blob/v3.8.0/Lib/shutil.py#L486

Trivial patches and an improved test case for:
3.7: veaviticus@a662ae8

3.8: veaviticus@64f72c7

3.9: veaviticus@e55dd12