Drop 'six' from datadog_checks_dev

[iliakur]

What does this PR do?

Along the way we update the tests to stop using the test markers that select tests based on python version.

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.05%. Comparing base (4ebe692) to head (7025bb7).
Report is 6 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
active_directory	86.36% <ø> (+14.27%)	⬆️
activemq	52.80% <ø> (ø)
activemq_xml	82.20% <ø> (ø)
amazon_msk	89.19% <ø> (ø)
ambari	85.75% <ø> (ø)
apache	95.08% <ø> (ø)
arangodb	98.23% <ø> (ø)
argo_rollouts	90.00% <ø> (ø)
argo_workflows	87.87% <ø> (ø)
argocd	87.23% <ø> (ø)
aspdotnet	100.00% <ø> (ø)
avi_vantage	91.35% <ø> (ø)
aws_neuron	92.42% <ø> (ø)
azure_iot_edge	82.08% <ø> (ø)
boundary	100.00% <ø> (ø)
btrfs	82.69% <ø> (ø)
cacti	87.90% <ø> (ø)
calico	84.61% <ø> (ø)
cassandra	66.66% <ø> (ø)
cert_manager	77.41% <ø> (ø)
cisco_aci	94.96% <ø> (ø)
citrix_hypervisor	87.50% <ø> (ø)
cloud_foundry_api	96.11% <ø> (ø)
cloudera	99.51% <ø> (ø)
cockroachdb	93.85% <100.00%> (-0.08%)	⬇️
consul	91.80% <ø> (ø)
coredns	95.65% <ø> (ø)
couch	94.83% <ø> (ø)
crio	89.79% <ø> (ø)
datadog_checks_base	88.97% <100.00%> (+0.26%)	⬆️
datadog_checks_dev	77.55% <77.77%> (+0.24%)	⬆️
datadog_checks_downloader	81.35% <ø> (+3.23%)	⬆️
datadog_cluster_agent	90.19% <ø> (ø)
dcgm	92.10% <ø> (ø)
ddev	87.35% <ø> (ø)
directory	95.03% <ø> (ø)
disk	89.32% <ø> (ø)
dns_check	93.29% <ø> (ø)
druid	97.70% <ø> (ø)
ecs_fargate	83.48% <ø> (ø)
eks_fargate	94.05% <ø> (ø)
envoy	92.78% <100.00%> (+3.10%)	⬆️
esxi	93.21% <ø> (ø)
etcd	95.56% <ø> (ø)
external_dns	89.28% <ø> (ø)
fluentd	84.32% <ø> (ø)
fluxcd	88.31% <ø> (ø)
fly_io	97.13% <ø> (ø)
foundationdb	83.83% <ø> (-0.30%)	⬇️
gitlab_runner	92.10% <ø> (ø)
glusterfs	80.00% <ø> (ø)
go_expvar	92.66% <ø> (ø)
gunicorn	92.16% <ø> (-0.75%)	⬇️
harbor	89.65% <ø> (ø)
hazelcast	92.30% <ø> (ø)
hdfs_datanode	89.63% <ø> (ø)
hdfs_namenode	86.60% <ø> (ø)
hive	51.42% <ø> (ø)
hivemq	61.90% <ø> (ø)
http_check	93.99% <ø> (ø)
ibm_db2	86.87% <ø> (ø)
ibm_i	81.91% <ø> (ø)
ibm_mq	91.31% <ø> (+0.09%)	⬆️
ignite	46.66% <ø> (ø)
impala	97.97% <ø> (ø)
istio	77.86% <ø> (ø)
jboss_wildfly	47.36% <ø> (ø)
kafka	64.70% <ø> (ø)
karpenter	95.06% <ø> (ø)
kong	88.42% <ø> (ø)
kube_apiserver_metrics	97.74% <ø> (ø)
kube_controller_manager	97.88% <ø> (ø)
kube_dns	95.94% <ø> (ø)
kube_metrics_server	94.87% <ø> (ø)
kube_proxy	96.80% <ø> (ø)
kube_scheduler	97.92% <ø> (ø)
kubeflow	93.22% <ø> (ø)
kubelet	90.99% <ø> (ø)
kubernetes_cluster_autoscaler	93.22% <ø> (ø)
kubernetes_state	89.49% <ø> (ø)
kubevirt_api	82.44% <ø> (ø)
kubevirt_controller	85.36% <ø> (ø)
kyototycoon	85.96% <ø> (ø)
kyverno	82.27% <ø> (ø)
lighttpd	83.64% <ø> (ø)
linkerd	84.70% <ø> (ø)
linux_proc_extras	96.20% <ø> (ø)
mapr	82.27% <ø> (ø)
mapreduce	81.99% <ø> (ø)
marathon	83.06% <ø> (ø)
mcache	93.48% <ø> (ø)
mesos_master	89.71% <ø> (ø)
mesos_slave	93.24% <ø> (ø)
nagios	89.01% <ø> (ø)
network	93.47% <ø> (ø)
nfsstat	95.20% <ø> (ø)
nginx	94.65% <ø> (ø)
nginx_ingress_controller	98.55% <ø> (ø)
nvidia_triton	88.52% <ø> (ø)
openldap	96.33% <ø> (ø)
openmetrics	98.05% <ø> (ø)
openstack	55.00% <ø> (-0.10%)	⬇️
pgbouncer	91.35% <ø> (ø)
php_fpm	90.45% <ø> (ø)
postfix	88.04% <ø> (ø)
powerdns_recursor	96.65% <ø> (ø)
presto	59.09% <ø> (ø)
process	85.57% <ø> (ø)
prometheus	94.17% <ø> (ø)
proxysql	98.97% <ø> (ø)
pulsar	100.00% <ø> (ø)
ray	96.45% <ø> (ø)
redisdb	87.72% <ø> (ø)
rethinkdb	97.93% <ø> (ø)
riak	99.21% <ø> (ø)
riakcs	88.82% <ø> (ø)
silk	93.82% <ø> (ø)
singlestore	90.81% <ø> (ø)
snowflake	96.27% <ø> (ø)
solr	56.25% <ø> (ø)
spark	94.14% <ø> (ø)
squid	100.00% <ø> (ø)
ssh_check	91.77% <ø> (ø)
statsd	87.36% <ø> (ø)
strimzi	89.78% <ø> (ø)
supervisord	89.78% <ø> (ø)
system_core	92.52% <ø> (ø)
system_swap	98.30% <ø> (ø)
tcp_check	90.39% <ø> (ø)
teamcity	87.25% <ø> (ø)
tekton	82.30% <ø> (ø)
teleport	99.61% <ø> (ø)
temporal	100.00% <ø> (ø)
teradata	94.05% <ø> (ø)
tibco_ems	91.98% <ø> (ø)
tls	91.68% <ø> (-0.04%)	⬇️
torchserve	97.32% <ø> (ø)
traefik_mesh	76.75% <ø> (ø)
traffic_server	96.13% <ø> (ø)
twemproxy	79.45% <ø> (ø)
twistlock	80.41% <ø> (ø)
varnish	84.22% <ø> (ø)
vllm	93.10% <ø> (ø)
vsphere	96.15% <ø> (ø)
weaviate	76.27% <ø> (ø)
win32_event_log	82.55% <ø> (ø)
wmi_check	97.50% <ø> (ø)
yarn	89.48% <ø> (ø)

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