move fuzzer code to _test files

[vaikas]

Signed-off-by: Ville Aikas vaikas@vmware.com

Addresses #4398

Proposed Changes

• Move our FuzzerFuncs to the roundtrip_test.go files so that they don't get baked into the resulting binaries.

Release Note

- 🧽 Update or clean up current behavior

Move fuzzer (test related code) to test files so they don't get baked into our binaries. Small reduction in binary size.

Docs

[codecov]

Codecov Report

Merging #4399 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4399      +/-   ##
==========================================
- Coverage   81.10%   81.06%   -0.05%     
==========================================
  Files         285      281       -4     
  Lines        8014     7964      -50     
==========================================
- Hits         6500     6456      -44     
+ Misses       1128     1122       -6     
  Partials      386      386              

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[slinkydeveloper]

/assign

[vaikas]

unrelated to this, existing datarace.
/test pull-knative-eventing-unit-tests

[slinkydeveloper]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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