Trim whitespace and slashes in pack names

Author: koesie10

extensions/ql-vscode/src/model-editor/extension-pack-name.ts

@@ -17,6 +17,17 @@ export function formatPackName(packName: ExtensionPackName): string {
 
 export function sanitizePackName(userPackName: string): ExtensionPackName {
   let packName = userPackName;
+
+  packName = packName.trim();
+
+  while (packName.startsWith("/")) {
+    packName = packName.slice(1);
+  }
+
+  while (packName.endsWith("/")) {
+    packName = packName.slice(0, -1);
+  }
+
   if (!packName.includes("/")) {
     packName = `pack/${packName}`;
   }

extensions/ql-vscode/test/unit-tests/model-editor/extension-pack-name.test.ts

@@ -58,6 +58,18 @@ describe("sanitizePackName", () => {
       name: "a/b--d--e-d-csharp",
       expected: "a/b-d-e-d-csharp",
     },
+    {
+      name: "/github/vscode-codeql",
+      expected: "github/vscode-codeql",
+    },
+    {
+      name: "github/vscode-codeql/",
+      expected: "github/vscode-codeql",
+    },
+    {
+      name: "///github/vscode-codeql///",
+      expected: "github/vscode-codeql",
+    },
   ];
 
   test.each(testCases)(