Add DataDog counters in old compatibility code.

Description

The code has several places with comments containing this string:

VS[compat]

All that code is to support old formats that should be obsolete and deprecated. However, it's unclear how many existing courses still use this compatibility code. Add DataDog incremental counters that increment whenever this compatibility code is used. That way, we can decide whether to finally remove all that code from the edx-platform codebase.

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Julia Eskew

Reporter

Julia Eskew

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3

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3

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