Make the command conditional on a supported CLI version

extensions/ql-vscode/package.json

@@ -1810,6 +1810,10 @@
         {
           "command": "codeQL.gotoQLContextEditor",
           "when": "false"
+        },
+        {
+          "command": "codeQL.trimCache",
+          "when": "codeql.supportsTrimCache"
         }
       ],
       "editor/context": [

extensions/ql-vscode/src/codeql-cli/cli.ts

@@ -1492,6 +1492,13 @@ export class CodeQLCliServer implements Disposable {
             CliVersionConstraint.CLI_VERSION_WITH_QUICK_EVAL_COUNT,
           ) >= 0,
         );
+        await this.app.commands.execute(
+          "setContext",
+          "codeql.supportsTrimCache",
+          newVersion.compare(
+            CliVersionConstraint.CLI_VERSION_WITH_TRIM_CACHE,
+          ) >= 0,
+        );
       } catch (e) {
         this._versionChangedListeners.forEach((listener) =>
           listener(undefined),
@@ -1755,6 +1762,12 @@ export class CliVersionConstraint {
     "2.14.0",
   );
 
+  /**
+   * CLI version where the query server supports the `evaluation/trimCache` method
+   * with `codeql database cleanup --mode=trim` semantics.
+   */
+  public static CLI_VERSION_WITH_TRIM_CACHE = new SemVer("2.15.1");
+
   constructor(private readonly cli: CodeQLCliServer) {
     /**/
   }