Fix --test for d8 shell runner

There seems to be two bugs when running
`d8 cli.js -- --test <subset>`:

1. A typo in cli.js (`cliParams.get("tests")` should've been
  `cliParams.get("test")`) which leads to

  ```
  cli.js:122: TypeError: Cannot read properties of undefined (reading 'split')
      let tests = cliParams.has("test") ? cliParams.get("tests").split(",") : []
                                                              ^
  TypeError: Cannot read properties of undefined (reading 'split')
      at cli.js:122:63
  ```
2. performance.mark/performance.measure in d8 requires PerformanceMark
  objects as arguments and do not take mark name strings.

  ```
  console.error: JetStream3 failed: Error: Invalid 'startMark' argument: Not an Object
  console.error: Error: Invalid 'startMark' argument: Not an Object
      at Driver.start (./JetStreamDriver.js:352:25)
      at async runJetStream (cli.js:135:9)
  cli.js:141: Error: Invalid 'startMark' argument: Not an Object
  ```

This patch fixes the typo in 1. For 2, since these are only used for
UI annotations, replace them with no-ops in d8 instead.

Author: joyeecheung

cli.js

@@ -119,7 +119,7 @@ const printHelp = cliParams.delete("help");
 const dumpTestList = cliParams.delete("dumpTestList");
 
 if (cliArgs.length) {
-    let tests = cliParams.has("test") ? cliParams.get("tests").split(",") : []
+    let tests = cliParams.has("test") ? cliParams.get("test").split(",") : []
     tests = tests.concat(cliArgs);
     cliParams.set("test", tests.join(","));
 }

utils/shell-config.js

@@ -55,3 +55,8 @@ if (typeof performance == "undefined")
 
 performance.mark ??= function(){};
 performance.measure ??= function(){};
+
+if (isD8) {
+    performance.mark = function(){};
+    performance.measure = function(){};
+}