[Telemetry] Switch empty action_name_to_run to 'RunPageInteractions' for 4 measurements:
[Telemetry] Switch empty action_name_to_run to 'RunPageInteractions' for 4 measurements:

+ ImageDecoding measurement:
This measurement is only paired with ImageDecodingMeasurementPageSet,
which contains pages with default RunPageInteractions which does nothing.

+ MemoryMultiTab measurement:
This measurement is not used by any benchmark. Though there are
ToughMemoryMultiTabPageSet which contains pages with default
RunPageInteractions which does nothing.

+PolymerLoadMeasurement measurement:
This measurement is paired with PicaPageSet & TopekaPageSet, both contain
only  pages with default RunPageInteractions which does nothing.

+RecordPerArea measurement:
This measurement is not used by any benchmark

BUG=418375

Review URL: https://codereview.chromium.org/804303003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#309832}

sahiljain/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,sahiljain/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult,benschmaus/catapult,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,benschmaus/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm