[Enum] update __contains__ to return True for valid values

[ethanfurman]

BPO	43957
Nosy	@ethanfurman, @pablogsal
PRs	bpo-43957: [Enum] deprecate TypeError from containment checks #25670 bpo-43957: Add a missing space to the new format enum warning #25770

^{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 = 'https://github.com/ethanfurman'
closed_at = <Date 2021-05-01.20:39:22.594>
created_at = <Date 2021-04-27.19:11:08.744>
labels = ['type-bug', '3.10']
title = '[Enum] update __contains__ to return True for valid values'
updated_at = <Date 2021-05-01.20:39:22.594>
user = 'https://github.com/ethanfurman'

bugs.python.org fields:

activity = <Date 2021-05-01.20:39:22.594>
actor = 'ethan.furman'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2021-05-01.20:39:22.594>
closer = 'ethan.furman'
components = []
creation = <Date 2021-04-27.19:11:08.744>
creator = 'ethan.furman'
dependencies = []
files = []
hgrepos = []
issue_num = 43957
keywords = ['patch']
message_count = 4.0
messages = ['392122', '392127', '392622', '392633']
nosy_count = 2.0
nosy_names = ['ethan.furman', 'pablogsal']
pr_nums = ['25670', '25770']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43957'
versions = ['Python 3.10']

[ethanfurman]

In 3.12 __contains__ will check for both members and values:

Color.RED in Color --> True
1 in Color --> True
'RED' in Color --> False

Add DeprecationWarning for now.

[ethanfurman]

New changeset 6bd9288 by Ethan Furman in branch 'master':
bpo-43957: [Enum] Deprecate TypeError from containment checks. (GH-25670)
6bd9288

[pablogsal]

New changeset 9a42d50 by Pablo Galindo in branch 'master':
bpo-43957: Add a missins space to the new format enum warning (bpo-25770)
9a42d50

[pablogsal]

Ethan can we close this issue?

[corona10]

@ethanfurman __contains__ should be updated before Python 3.12 is released.
I add this issue as a release blocker since tests are broken.
cc @pablogsal