Remove use of deprecated RulesDefinitionXmlLoader

[pavel-mikula-sonarsource]

We generate rules.xml file with rule descriptions that is imported by RulesDefinitionXmlLoader on the SQ plugin side.

The only useful information that the file contains is a list of parameters of the rules. The rest can be read directly from the JSON files.

We should simplify rules.xml to contain only that. And consider moving to json instead.

We should not depend on RulesDefinitionXmlLoader, as it is deprecated by SQ, see SONAR-14908.

Data flow before:

rspec files -> rspec script -> Analyzer resx --+-> Utilities -> RuleDescriptorGenerator -> rules.xml -> Java plugin
Rule parameters from reflection --------------´

Data flow after:

rspec files ---------------------------------------------------------------------+-> Java plugin
Rule parameters from reflection -> RuleDescriptorGenerator -> parameters.json --´