[vs17.7] Backward-compatibility with KeyValuePair<string, string> metadata items [#8864] #8978
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Summary
Fixes regression (#8864) that prevents some older tasks from succeeding.
Customer Impact
Build breaks reported by external customer on upgrade to 17.6. No known workaround beyond "don't use affected tasks".
Regression?
Yes, from 17.5 via #8240 and #8646.
Testing
Automated tests and manual testing in the repro scenario.
Risk
Low--adds fallback to code that is almost identical to the pre-regression codepath when we can't use a newer bulk method.