Allow disabling querying an exporter

[ian28223]

What does this PR do?

Allows to disable querying an exporter by setting the port to 0

Motivation

• AGENT-7470

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[maycmlee]

👍 for docs.

[sarah-witt]

Looks good! Can you write a test for when each of these are disabled?

[codecov]

Codecov Report

Merging #11306 (d2b1d4c) into master (32a4d58) will decrease coverage by 0.44%.
The diff coverage is 87.27%.

Flag	Coverage Δ
active_directory	?
activemq_xml	?
aerospike	?
airflow	?
amazon_msk	88.67% <87.27%> (-0.17%)	⬇️
ambari	?
apache	?
aspdotnet	?
avi_vantage	?
azure_iot_edge	?
btrfs	?
cacti	?
cassandra_nodetool	?
ceph	?
cilium	?
cisco_aci	?
citrix_hypervisor	?
clickhouse	?
cloud_foundry_api	?
cockroachdb	?
consul	?
coredns	?
couch	?
couchbase	?
crio	?
datadog_checks_base	?
datadog_checks_dev	?
datadog_checks_downloader	?
datadog_cluster_agent	?
directory	?
disk	?
dns_check	?
dotnetclr	?
druid	?
ecs_fargate	?
eks_fargate	?
elastic	?
envoy	?
etcd	?
exchange_server	?
external_dns	?
fluentd	?
gearmand	?
gitlab	?
gitlab_runner	?
glusterfs	?
go_expvar	?
gunicorn	?
haproxy	?
harbor	?
hazelcast	?
hdfs_datanode	?
hdfs_namenode	?
http_check	?
ibm_db2	?
ibm_i	?
ibm_mq	?
ibm_was	?
iis	?
istio	?
kafka_consumer	?
kong	?
kube_apiserver_metrics	?
kube_controller_manager	?
kube_dns	?
kube_metrics_server	?
kube_proxy	?
kube_scheduler	?
kubelet	?
kubernetes_state	?
kyototycoon	?
lighttpd	?
linkerd	?
linux_proc_extras	?
mapr	?
mapreduce	?
marathon	?
marklogic	?
mcache	?
mesos_master	?
mesos_slave	?
mongo	?
mysql	?
nagios	?
network	?
nfsstat	?
nginx	?
nginx_ingress_controller	?
openldap	?
openmetrics	?
openstack	?
openstack_controller	?
oracle	?
pdh_check	?
pgbouncer	?
php_fpm	?
postfix	?
postgres	?
powerdns_recursor	?
process	?
prometheus	?
proxysql	?
rabbitmq	?
redisdb	?
rethinkdb	?
riak	?
riakcs	?
sap_hana	?
scylla	?
singlestore	?
snmp	?
snowflake	?
sonarqube	?
spark	?
sqlserver	?
squid	?
ssh_check	?
statsd	?
supervisord	?
system_core	?
system_swap	?
tcp_check	?
teamcity	?
tls	?
twemproxy	?
twistlock	?
varnish	?
vault	?
vertica	?
voltdb	?
vsphere	?
win32_event_log	?
windows_performance_counters	?
windows_service	?
wmi_check	?
yarn	?
zk	?

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