feat(inputs.sqlserver): improved filtering for active requests

[deweter]

• Updated associated README.md.
• Wrote appropriate unit tests.
• Pull request title or commits are in conventional commit format

The output from sys.dm_exec_requests contains a static request from telegraf which has no added value and only makes the output larger and harder to read. The only situation, when this should be shown is when it becomes a heading blocker. This unlikely possibility is taken into account in a code. Similar filter is used by other monitoring tools and is included in Glenn Berry's diagnostic queries solution

This is a sample ouput before this feat on idle system. It contains a telegraf request to gain the requests:

This is a sample output after this change on idle system:

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

☺️ This pull request doesn't significantly change the Telegraf binary size (less than 1%)

📦 Click here to get additional PR build artifacts

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[deweter]

Please, can someone make a review? @powersj @MyaLongmire

[MyaLongmire]

@deweter Thanks for the pr, sorry we haven't gotten back to you yet.

The code looks okay to me but does this break backward compatibility for some users?

[deweter]

I don't think so as the output from this query was completely wrong for several months and we fixed it recently in PR #11701.

[srebhan]

Looks good to me. Thanks for the contribution @deweter and sorry for the late response!