fuzzing: add call to IndexKeys in multiple fuzzers

[AdamKorcz]

Signed-off-by: AdamKorcz adam@adalogics.com

Summary

Adds a call to IndexKeys() for the created entry in multiple fuzzers.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1302 (ee95826) into main (d07be7c) will decrease coverage by 20.38%.
The diff coverage is n/a.

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@@             Coverage Diff             @@
##             main    #1302       +/-   ##
===========================================
- Coverage   63.19%   42.81%   -20.38%     
===========================================
  Files          82       74        -8     
  Lines        7854     7406      -448     
===========================================
- Hits         4963     3171     -1792     
- Misses       2260     3905     +1645     
+ Partials      631      330      -301     

Flag	Coverage Δ
e2etests	?
unittests	42.81% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
pkg/api/metrics.go	0.00% <0.00%> (-100.00%)	⬇️
cmd/rekor-cli/app/useragent.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/api/trillian_client.go	0.00% <0.00%> (-66.31%)	⬇️
pkg/api/entries.go	0.00% <0.00%> (-64.65%)	⬇️
pkg/api/api.go	0.00% <0.00%> (-64.29%)	⬇️
pkg/types/types.go	0.00% <0.00%> (-63.64%)	⬇️
pkg/types/versionmap.go	0.00% <0.00%> (-63.42%)	⬇️
pkg/api/error.go	0.00% <0.00%> (-58.70%)	⬇️
cmd/rekor-cli/app/verify.go	2.47% <0.00%> (-53.72%)	⬇️
cmd/rekor-cli/app/log_info.go	2.50% <0.00%> (-52.50%)	⬇️
... and 43 more

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