Path.home() should ignore HOME env var like os.path.expanduser()

BPO	38883
Nosy	@brettcannon, @zooba, @lazka, @asottile, @miss-islington, @isidentical
PRs	bpo-38883: Don't honor POSIX `HOME` in `pathlib.Path.home/expanduser` on Windows #17961 [3.8] bpo-38883: Don't use POSIX `$HOME` in `pathlib.Path.home/expanduser` on Windows (GH-17961) #18229

^{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 = <Date 2020-01-28.09:59:05.741>
created_at = <Date 2019-11-21.18:45:12.057>
labels = ['3.8', 'library', '3.9']
title = 'Path.home() should ignore HOME env var like os.path.expanduser()'
updated_at = <Date 2020-01-28.09:59:47.636>
user = 'https://github.com/lazka'

bugs.python.org fields:

activity = <Date 2020-01-28.09:59:47.636>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-28.09:59:05.741>
closer = 'steve.dower'
components = ['Library (Lib)']
creation = <Date 2019-11-21.18:45:12.057>
creator = 'lazka'
dependencies = []
files = []
hgrepos = []
issue_num = 38883
keywords = ['patch']
message_count = 4.0
messages = ['357196', '360847', '360852', '360854']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'steve.dower', 'lazka', 'Anthony Sottile', 'miss-islington', 'BTaskaya']
pr_nums = ['17961', '18229']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38883'
versions = ['Python 3.8', 'Python 3.9']