Remove Security Hotspot rules which are not targeting developers

[nicolas-harraudeau-sonarsource]

The following rules will be removed:

• RSPEC-4797 Handling files is security-sensitive
• RSPEC-4721 Executing OS commands is security-sensitive
• RSPEC-4825 Sending HTTP requests is security-sensitive (will be replaced by RSPEC-5332 and the taint analysis rules using HTTP requests as sources and sinks)
• RSPEC-4817 Executing XPath expressions is security-sensitive
• RSPEC-4529 Exposing HTTP endpoints is security-sensitive
• RSPEC-1523 Dynamically executing code is security-sensitive (because it only handles introspection, no eval or exec method in C#)