regrtest: log unraisable exceptions and uncaught thread exceptions

BPO	37069
Nosy	@vstinner
PRs	bpo-37069: regrtest: unraisable marks test as ENV_CHANGED #13759 bpo-37069: tests use catch_unraisable_exception() #13762

^{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 2019-07-29.23:50:33.580>
created_at = <Date 2019-05-27.22:51:24.824>
labels = ['3.8', 'tests']
title = 'regrtest: log unraisable exceptions and uncaught thread exceptions'
updated_at = <Date 2019-07-29.23:50:33.579>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-07-29.23:50:33.579>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-29.23:50:33.580>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2019-05-27.22:51:24.824>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 37069
keywords = ['patch']
message_count = 6.0
messages = ['343693', '343696', '344341', '344365', '345425', '348705']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['13759', '13762']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37069'
versions = ['Python 3.8']