Drop 'tech-inventory' and 'code duplication' queries from the standard query suites

cpp/ql/src/external/DuplicateBlock.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Duplicate code
  * @description This block of code is duplicated elsewhere. If possible, the shared code should be refactored so there is only one occurrence left. It may not always be possible to address these issues; other duplicate code checks (such as duplicate function, duplicate class) give subsets of the results with higher confidence.
  * @kind problem

cpp/ql/src/external/DuplicateFunction.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Duplicate function
  * @description There is another identical implementation of this function. Extract the code to a common file or superclass or delegate to improve sharing.
  * @kind problem

cpp/ql/src/external/MostlyDuplicateClass.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Mostly duplicate class
  * @description More than 80% of the methods in this class are duplicated in another class. Create a common supertype to improve code sharing.
  * @kind problem

cpp/ql/src/external/MostlyDuplicateFile.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Mostly duplicate file
  * @description There is another file that shares a lot of the code with this file. Merge the two files to improve maintainability.
  * @kind problem

cpp/ql/src/external/MostlyDuplicateFunction.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Mostly duplicate function
  * @description There is another function that shares a lot of the code with this one. Extract the code to a common file/superclass or delegate to improve sharing.
  * @kind problem

cpp/ql/src/external/MostlySimilarFile.ql

@@ -1,4 +1,5 @@
 /**
+ * @deprecated
  * @name Mostly similar file
  * @description There is another file that shares a lot of the code with this file. Notice that names of variables and types may have been changed. Merge the two files to improve maintainability.
  * @kind problem