fix: mute graylog UDP/TCP tests by marking them as integration

[sspaink]

The graylog plugins UDP/TCP support was a recent addition (#9644), and now the graylog tests are failing randomly: https://app.circleci.com/pipelines/github/influxdata/telegraf/6802/workflows/614bcc62-e1d8-4d6c-8eb8-34667650f615/jobs/118647 They rely on setting up a TCP and UDP server, this is the easiest solution to just mark them as integration tests and not run them. We don't currently run integration tests in our CI at all, so maybe there is a better way to refactor these tests so they don't rely on tcp/udp servers but it isn't obvious to me how.

[telegraf-tiger]

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Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	linux_i386.tar.gzi386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz