test_runner: do not read from process.argv and process.cwd() in run()

Currently the codebase for `runner.js` accesses some properties of
`process`, capturing options there. However, since `run()` is
exposed to end users, we should capture all this information in
`lib/internal/main/test_runner.js` and pass it down to `run()` as options.

This commit updates `run()` to default `cwd` to `.` instead of
reading `process.cwd()`, and substitutes `process.execArgv` with
the provided `execArgv` option when propagating V8 flags.
It also updates `test_runner.js` to explicitly pass these options.

Author: Saiteja Bandaru

lib/internal/main/test_runner.js

@@ -31,6 +31,8 @@ if (isUsingInspector() && options.isolation === 'process') {
 }
 
 options.globPatterns = ArrayPrototypeSlice(process.argv, 1);
+options.cwd = process.cwd();
+options.execArgv = process.execArgv;
 
 debug('test runner configuration:', options);
 run(options).on('test:summary', (data) => {

lib/internal/test_runner/runner.js

@@ -207,7 +207,7 @@ function getRunArgs(path, { forceExit,
    */
   const nodeOptionsSet = new SafeSet(processNodeOptions);
   const unknownProcessExecArgv = ArrayPrototypeFilter(
-    process.execArgv,
+    execArgv,
     (arg, i, arr) => !nodeOptionsSet.has(arg) && filterExecArgv(arg, i, arr),
   );
   ArrayPrototypePushApply(runArgs, unknownProcessExecArgv);
@@ -730,7 +730,7 @@ function run(options = kEmptyObject) {
     randomSeed: suppliedRandomSeed,
     execArgv = [],
     argv = [],
-    cwd = process.cwd(),
+    cwd = '.',
     rerunFailuresFilePath,
     env,
   } = options;