Emulate an Agent shutdown after every test that uses the dd_run_check fixture by default

[ofek]

Motivation

Some checks need to clean up resources like long running threads

[codecov]

Codecov Report

Merging #12371 (2e362ad) into master (5c3d753) will increase coverage by 0.02%.
The diff coverage is n/a.

Flag	Coverage Δ
ambari	85.75% <ø> (ø)
arangodb	98.21% <ø> (ø)
avi_vantage	91.92% <ø> (ø)
azure_iot_edge	82.00% <ø> (ø)
btrfs	82.91% <ø> (ø)
cacti	83.95% <ø> (ø)
calico	83.33% <ø> (ø)
citrix_hypervisor	87.50% <ø> (ø)
crio	89.79% <ø> (ø)
directory	94.87% <ø> (ø)
ecs_fargate	80.23% <ø> (ø)
eks_fargate	94.05% <ø> (ø)
external_dns	89.09% <ø> (ø)
go_expvar	92.73% <ø> (ø)
hazelcast	92.39% <ø> (ø)
ibm_i	81.58% <ø> (ø)
istio	77.65% <ø> (+0.55%)	⬆️
kube_dns	98.85% <ø> (ø)
kube_scheduler	96.98% <ø> (ø)
kyototycoon	85.96% <ø> (ø)
linkerd	85.14% <ø> (+1.14%)	⬆️
linux_proc_extras	96.22% <ø> (ø)
mapr	82.70% <ø> (ø)
nagios	89.53% <ø> (ø)
network	78.78% <ø> (+0.88%)	⬆️
oracle	91.39% <ø> (+2.45%)	⬆️
postfix	88.04% <ø> (ø)

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