[subinterpreters] Lingering subinterpreters should be implicitly cleared on shutdown

ncoghlan

BPO	36225
Nosy	@ncoghlan, @vstinner, @ned-deily, @encukou, @ericsnowcurrently, @soltysh, @JulienPalard, @nanjekyejoannah, @LewisGaul, @NasaGeek
PRs	gh-80406: Finalise subinterpreters in Py_FinalizeEx() #17575
Files	finalise-subinterps-test.diff

^{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 2019-03-07.13:17:43.665>
labels = ['expert-subinterpreters', '3.10', 'type-crash']
title = '[subinterpreters] Lingering subinterpreters should be implicitly cleared on shutdown'
updated_at = <Date 2021-12-16.23:53:44.369>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2021-12-16.23:53:44.369>
actor = 'nasageek'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Subinterpreters']
creation = <Date 2019-03-07.13:17:43.665>
creator = 'ncoghlan'
dependencies = []
files = ['48733']
hgrepos = []
issue_num = 36225
keywords = ['patch']
message_count = 17.0
messages = ['337392', '337743', '337852', '339149', '339150', '339191', '345802', '349119', '349124', '353873', '357193', '357235', '364587', '371338', '371571', '379366', '379718']
nosy_count = 10.0
nosy_names = ['ncoghlan', 'vstinner', 'ned.deily', 'petr.viktorin', 'eric.snow', 'maciej.szulik', 'mdk', 'nanjekyejoannah', 'LewisGaul', 'nasageek']
pr_nums = ['17575']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue36225'
versions = ['Python 3.10']