fix(inputs.win_eventlog): Handle remote events more robustly.

[srebhan]

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

resolves #12328

This PR fixes a panic in inputs.win_eventlog for cases where events are sent by a remote machine (i.e. via Windows-event-forwarding) which is unavailable at the time Telegraf gathers those events. The root cause is that Windows' EvtFormatMessage syscall is expecting a handle to the publisher (i.e. the machine that sent the event) which is becoming invalid if that publisher is down. As a consequence Windows throws an exception (read Golang panic) instead of returning a simple error.

The implemented approach is to completely avoid the EvtFormatMessage syscall for remote events and instead use the RenderingInfo attached to the event itself (only existing for remote events).

[powersj]

Merge once debug statement is removed!

[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%)

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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	darwin_arm64.tar.gz	windows_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
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