Make vcpkg.json comment multiline

[antkmsft]

Now that microsoft/vcpkg#34877 is fixed, we can format vcpkg.json comment as multi-line.
This way, it is better visible, and it aligns with the existing portfile.cmake comment, which is also multi-line:

azure-sdk-for-cpp/sdk/core/azure-core/vcpkg/portfile.cmake

Lines 4 to 5 in 37e1952

	# NOTE: All changes made to this file will get overwritten by the next port release.
	# Please contribute your changes to https://github.com/Azure/azure-sdk-for-cpp.

I am updating the vcpkg commit SHA to microsoft/vcpkg@43cf47e, because that is the commit which updates vcpkg to the 2023-11-16 release - vcpkg-tool release which contains bugfix for microsoft/vcpkg#34877: https://github.com/microsoft/vcpkg-tool/releases/tag/2023-11-16

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@LarryOsterman, I am adding #include <opentelemetry/sdk/trace/recordable.h> for the sdk/core/azure-core-tracing-opentelemetry/test/ut/test_exporter.hpp. It only updates the unit test code and does not require a package release (unit tests are not compiled when our SDK is being installed as vcpkg package). It is not a breaking change either. Everything should compile with both the previous version of opentelemetry-cpp, and the new one.

The reason is - vcpkg now has an updated version of opentelemetry-cpp - 1.12.0 - microsoft/vcpkg#33983.

And one of the commits which went into that version, was "[SDK] Header files cleanup, use forward declarations", which has specifically dropped #include <opentelemetry/sdk/trace/recordable.h> line from the opentelemetry/sdk/trace/exporter.h, which is the only header file that we were including before at that place. But it is no longer sufficient:
open-telemetry/opentelemetry-cpp@cfcda57#diff-c44d1944597823ab10bd389630f778367fb19eaac5ae68cdefa5e8d5f71a5783L9