datastore GetGetPayloadResponse logging cleanup

[metachris]

📝 Summary

include some context in datastore.GetGetPayloadResponse logs

---

✅ I have run these commands

• make lint
• make test-race
• go mod tidy
• I have seen and agree to CONTRIBUTING.md

[codecov-commenter]

Codecov Report

Merging #465 (b9b3a0a) into main (2d3436d) will increase coverage by 0.90%.
The diff coverage is 54.05%.

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@@            Coverage Diff             @@
##             main     #465      +/-   ##
==========================================
+ Coverage   29.94%   30.85%   +0.90%     
==========================================
  Files          24       24              
  Lines        4712     4739      +27     
==========================================
+ Hits         1411     1462      +51     
+ Misses       3106     3079      -27     
- Partials      195      198       +3     

Flag	Coverage Δ
unittests	30.85% <54.05%> (+0.90%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
database/mockdb.go	0.00% <0.00%> (ø)
datastore/datastore.go	21.08% <60.00%> (+21.08%)	⬆️
common/test_utils.go	44.68% <68.75%> (+12.42%)	⬆️

... and 1 file with indirect coverage changes