fix: npm releases failing to generate provenance (#3800)

We are [seeing](https://github.com/cdk8s-team/cdk8s-plus/actions/runs/8081657712/job/22080844284) the following error in NPM releases: 

```console
npm ERR! Can't generate provenance for new or private package, you must set `access` to public.
```

As of Feb 14, projen [has started](projen/projen#3330) [generating provenance statements](https://docs.npmjs.com/generating-provenance-statements) for NPM releases (on by default for public packages). 
It is not clear why we are seeing the failure above because `access` should be `public` by default for public packages.
My suspicion is that for the very first version of a package, `access` must be explicitly set. Trying this out.

.projenrc.ts

@@ -72,6 +72,10 @@ const project = new Cdk8sTeamJsiiProject({
 // Used in K8s upgrade tests to control publishing of new branches
 project.package.addField('private', false);
 
+// not using `npmAccess` property because projen omits values that are
+// identical to npm defaults.
+project.package.addField('publishConfig', { access: 'public' });
+
 project.gitignore.exclude('.vscode/');
 
 const importdir = path.join('src', 'imports');