fixed more vulnerabilities (#3252)

A few benign "vulnerabilities" are being detected in our test code.

This PR cleans up tests that need unnecessary dependencies or
credentials (e.g. certs).

1. Removed unnecessary go.mod from codescan fixture (bug #3125):
   the go mod is now generated dynamically during the test
2. Removed certificates and keys generated for test or demo purpose

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

fixtures/bugs/3125/full/api/api.go

@@ -1,3 +1,5 @@
+//go:build testintegration
+
 package api
 
 import (

fixtures/bugs/3125/full/docs/docs.go

@@ -1,24 +1,26 @@
+//go:build testintegration
+
 // Package classification awesome.
 //
 // Documentation of our awesome API.
 //
-//     Schemes: http
-//     BasePath: /
-//     Version: 1.0.0
-//     Host: some-url.com
+//	 Schemes: http
+//	 BasePath: /
+//	 Version: 1.0.0
+//	 Host: some-url.com
 //
-//     Consumes:
-//     - application/json
+//	 Consumes:
+//	 - application/json
 //
-//     Produces:
-//     - application/json
+//	 Produces:
+//	 - application/json
 //
-//     Security:
-//     - basic
+//	 Security:
+//	 - basic
 //
-//    SecurityDefinitions:
-//    basic:
-//      type: basic
+//	SecurityDefinitions:
+//	basic:
+//	  type: basic
 //
 // swagger:meta
 package docs

fixtures/bugs/3125/full/docs/foorbar.go

@@ -1,3 +1,5 @@
+//go:build testintegration
+
 package docs
 
 import "swagger/api"

fixtures/bugs/3125/full/go.mod

@@ -1,3 +1,5 @@
+//go:build testintegration
+
 package main
 
 import (