fix(webhook): Rewind HTTP request body upon request failure

[yquansah]

fixes: #2127
This PR is for fixing this issue.

The client was not sending a body in the request upon failure, and that is due to not "rewinding" the HTTP body upon failure.

In this change, we create a request every time we are communicating with the webhook server to avoid those types of errors.

[codecov]

Codecov Report

Merging #2143 (829f481) into main (734e7c9) will decrease coverage by 0.03%.
The diff coverage is 46.66%.

@@            Coverage Diff             @@
##             main    #2143      +/-   ##
==========================================
- Coverage   70.65%   70.63%   -0.03%     
==========================================
  Files          73       73              
  Lines        7054     7062       +8     
==========================================
+ Hits         4984     4988       +4     
- Misses       1785     1788       +3     
- Partials      285      286       +1     

Files Changed	Coverage Δ
internal/server/audit/webhook/client.go	87.17% <46.66%> (-4.25%)	⬇️

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