Remove `service:mcnulty` from default monitor tagging

[api-clients-generation-pipeline[bot]]

trafficstars

See DataDog/datadog-api-spec#3803 Test branch datadog-api-spec/test/daniel-m-dd-patch-1

[datadog-datadog-prod-us1[bot]]

Datadog Report

All test runs aa87aa0 :link:

:white_check_mark: 5 Total Test Services: 0 Failed, 4 Passed

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Total Time	Test Service View
org.codehaus.plexus.classworlds.launcher.launcher	0	0	0	0	0	4m 11.33s	Link
surefirebooter11679723695029328719	0	0	0	1252	36	0s	Link
surefirebooter1609784141221899262	0	0	0	1252	36	0s	Link
surefirebooter2430457002768067297	0	0	0	1252	36	0s	Link
surefirebooter7290683049325753090	0	0	0	1252	36	0s	Link

[github-actions[bot]]

This PR has been automatically marked as stale because it has not had activity in the last 30 days. If there is no activity for another 90 days, this issue will be automatically closed.