[prism] Tiny lint fixes

[lostluck]

Fix urns package comment.
Use any instead of interface{} in config_test.go
Fix checkpointing typo.

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[codecov]

Codecov Report

Merging #25564 (778e087) into master (85ebc2f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25564   +/-   ##
=======================================
  Coverage   72.13%   72.13%           
=======================================
  Files         771      771           
  Lines      101870   101870           
=======================================
+ Hits        73479    73481    +2     
+ Misses      26966    26964    -2     
  Partials     1425     1425           

Flag	Coverage Δ
go	51.23% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...ks/go/pkg/beam/runners/prism/internal/urns/urns.go	100.00% <ø> (ø)
.../beam/runners/prism/internal/jobservices/server.go	76.00% <0.00%> (+8.00%)	⬆️

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