Allow enabling of tracing for tests with an environment variable

[ofek]

Motivation

Conditional enablement with an environment variable is much easier for CI configuration than formatting a command with the flag

[codecov]

Codecov Report

Merging #14206 (d66079c) into master (b24ab84) will decrease coverage by 0.03%.
The diff coverage is n/a.

Flag	Coverage Δ
ambari	85.75% <ø> (ø)
arangodb	98.21% <ø> (ø)
argocd	88.43% <ø> (ø)
avi_vantage	92.54% <ø> (ø)
azure_iot_edge	82.00% <ø> (ø)
boundary	100.00% <ø> (ø)
btrfs	82.91% <ø> (ø)
cisco_aci	95.27% <ø> (ø)
citrix_hypervisor	87.50% <ø> (ø)
cloud_foundry_api	95.98% <ø> (+0.12%)	⬆️
cloudera	99.82% <ø> (ø)
crio	89.79% <ø> (ø)
datadog_checks_downloader	80.48% <ø> (ø)
ddev	98.64% <ø> (ø)
disk	89.64% <ø> (-2.15%)	⬇️
dns_check	93.90% <ø> (ø)
druid	97.70% <ø> (ø)
eks_fargate	94.05% <ø> (ø)
foundationdb	78.50% <ø> (-0.30%)	⬇️
gunicorn	92.10% <ø> (ø)
hazelcast	92.39% <ø> (ø)
ibm_i	81.95% <ø> (ø)
kube_apiserver_metrics	97.95% <ø> (ø)
kube_controller_manager	96.00% <ø> (ø)
kube_dns	95.97% <ø> (ø)
kube_metrics_server	94.87% <ø> (ø)
kube_proxy	96.80% <ø> (ø)
kube_scheduler	96.53% <ø> (ø)
kubelet	90.96% <ø> (ø)
kyototycoon	85.96% <ø> (ø)
lighttpd	83.64% <ø> (ø)
linux_proc_extras	96.22% <ø> (ø)
mapr	82.70% <ø> (ø)
nagios	89.01% <ø> (ø)
openmetrics	97.90% <ø> (ø)
openstack_controller	91.12% <ø> (ø)
php_fpm	90.25% <ø> (+0.84%)	⬆️
pulsar	100.00% <ø> (ø)
riak	99.22% <ø> (ø)
silk	93.51% <ø> (ø)
singlestore	90.81% <ø> (ø)

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