return full entryID on HTTP 409 responses

[bobcallaway]

Fixes #1649

[codecov]

Codecov Report

Merging #1650 (aee6530) into main (6208b39) will decrease coverage by 17.99%.
Report is 2 commits behind head on main.
The diff coverage is 55.55%.

@@             Coverage Diff             @@
##             main    #1650       +/-   ##
===========================================
- Coverage   66.93%   48.95%   -17.99%     
===========================================
  Files          88       88               
  Lines        8804     8811        +7     
===========================================
- Hits         5893     4313     -1580     
- Misses       2213     3650     +1437     
- Partials      698      848      +150     

Flag	Coverage Δ
e2etests	48.95% <55.55%> (-0.01%)	⬇️
unittests	?

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Files Changed	Coverage Δ
pkg/api/entries.go	65.42% <55.55%> (-0.34%)	⬇️

... and 46 files with indirect coverage changes