The jaeger-idl now has a copy of thrift-gen types. We want to remove jaeger's dependency on jaeger/thrift-gen in favor of jaeger-idl/thrift-gen,

• fix(deps): update github.com/jaegertracing/jaeger-idl digest to c9efb29 #6605
• remove auto-generated code and replace its types / functions with aliases to jaeger-idl hosted types (see Redefine model/ and api_v2/ types as aliases to jaeger-idl/ types #6602 for similar change for proto types)
• replace all imports of jaeger/thrift-gen/* with jaeger-idl/thrift-gen/* (similar to Replace model imports with jaeger-idl #6595)
• migrate samping.thrift to jaeger-idl similar to above
• remove baggage.thrift code-gen steps and code, as it is unused
• remove Thrift generation from jaeger repo altogether