[v1.3-cherrypick] Fix reads on the group key management cluster to handle chunking correctly #37020
+426
−4
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We were not propagating out encoding status, so when we reached end of packet we would just silently return CHIP_NO_ERROR instead of indicating we had more data to encode.
Cherry-pick of #36975
Fixes #36882
Testing
Tests were added/updated, unfortunately have to be run manually for now.