fix: remove unnecessary wp injected cached assets
fix: remove unnecessary wp injected cached assets

- Blacklist, instead of whitelisting files
- Add .map files to blacklist
- Fix tinymce skins file regex

BEFORE:
```
LOG from InjectManifest
<i> The service worker at service-worker.js will precache
<i>         454 URLs, totaling 31.8 MB.
```
AFTER:
```
LOG from InjectManifest
<i> The service worker at service-worker.js will precache
<i>         392 URLs, totaling 23.9 MB.
```

lafranceinsoumise/api-django,lafranceinsoumise/api-django,lafranceinsoumise/api-django,lafranceinsoumise/api-django