CHE-5452: Normilize agent names (eclipse-che#5479)

Author: vinokurig

agents/exec/src/main/resources/org.eclipse.che.exec.json

@@ -1,6 +1,6 @@
 {
   "id": "org.eclipse.che.exec",
-  "name": "Exec-agent",
+  "name": "Exec",
   "description": "Agent for command execution",
   "dependencies": [],
   "properties": {},

agents/git-credentials/src/main/resources/org.eclipse.che.git.json

@@ -1,5 +1,5 @@
 {
   "id": "org.eclipse.che.git-credentials",
-  "name": "Git-Credentials-Agent",
+  "name": "Git credentials",
   "description": "Agent fetches SSH keys, Git username and email from CHE user preferences, and injects to console Git"
 }

agents/unison/src/main/resources/org.eclipse.che.unison.json

@@ -1,6 +1,6 @@
 {
   "id": "org.eclipse.che.unison",
-  "name": "File Sync",
+  "name": "File sync",
   "description": "Unison File Synchronizer",
   "dependencies": [],
   "properties": {}