Improving clientpool with client certificates

[Mzack9999]

Proposed changes

Closes #3800

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[forgedhallpass]

I've tested the fix on the test application provided in the ticket and also on a client's environment. It seems to be working. Thank you @Mzack9999 !

nuclei -t clientCertTest.yaml -ca server.crt -cc client.crt -ck client.key -debug

                     __     _
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  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v2.9.6

                projectdiscovery.io

[INF] Current nuclei version: v2.9.6 (latest)
[INF] Current nuclei-templates version: v9.5.3 (latest)
[INF] New templates added in latest release: 82
[INF] Templates loaded for current scan: 1
[INF] [client-cert-test] Dumped HTTP request for https://localhost:8443

GET / HTTP/1.1
Host: localhost:8443
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip

[DBG] [client-cert-test] Dumped HTTP response https://localhost:8443

HTTP/1.1 200 OK
Connection: close
Content-Length: 76
Content-Type: text/plain; charset=utf-8
Date: Thu, 22 Jun 2023 22:28:13 GMT

Hello, CN=versprite.com,OU=DevSecOps,O=VerSprite,L=Atlanta,ST=Georgia,C=US!
[client-cert-test:dsl-1] [http] [low] https://localhost:8443

[tarunKoyalwar]

lgtm !

$  TESTS="generic/auth/certificate/http-get.yaml" ./run.sh 
::group::Build nuclei
::endgroup::
::group::Build nuclei integration-test
::endgroup::
::group::Installing nuclei templates

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v2.9.6

		projectdiscovery.io

[INF] No new updates found for nuclei templates
::endgroup::
[✓] Test "generic/auth/certificate/http-get.yaml" passed!