SONARJAVA-5544 Deprecate rule S6291

Author: dorian-burihabwa-sonarsource

its/autoscan/src/test/resources/autoscan/autoscan-diff-by-rules.json

@@ -2735,12 +2735,6 @@
     "falseNegatives": 0,
     "falsePositives": 0
   },
-  {
-    "ruleKey": "S6291",
-    "hasTruePositives": true,
-    "falseNegatives": 0,
-    "falsePositives": 0
-  },
   {
     "ruleKey": "S6293",
     "hasTruePositives": true,

its/autoscan/src/test/resources/autoscan/diffs/diff_S6291.json

@@ -1,3 +1,4 @@
+<p>This rule is deprecated, and will eventually be removed.</p>
 <p>Storing data locally is a common task for mobile applications. Such data includes preferences or authentication tokens for external services, among
 other things. There are many convenient solutions that allow storing data persistently, for example SQLiteDatabase, SharedPreferences, and Realm. By
 default these systems store the data unencrypted, thus an attacker with physical access to the device can read them out easily. Access to sensitive

sonar-java-plugin/src/main/resources/org/sonar/l10n/java/rules/java/S6291.html

@@ -7,15 +7,12 @@
     },
     "attribute": "TRUSTWORTHY"
   },
-  "status": "ready",
+  "status": "deprecated",
   "remediation": {
     "func": "Constant\/Issue",
     "constantCost": "10min"
   },
-  "tags": [
-    "cwe",
-    "android"
-  ],
+  "tags": [],
   "defaultSeverity": "Major",
   "ruleSpecification": "RSPEC-6291",
   "sqKey": "S6291",

sonar-java-plugin/src/main/resources/org/sonar/l10n/java/rules/java/S6291.json

@@ -437,7 +437,6 @@
     "S6262",
     "S6263",
     "S6288",
-    "S6291",
     "S6293",
     "S6300",
     "S6301",