fix(service-worker): let * match 0 characters in globs (#23339)

In [glob patterns][1], the `*` wildcard is supposed to match 0 or more
characters.

For reference:
- This is also how `*` works in other implementations, such as
  `.gitignore` files or Firebase hosting config.
- Some popular JS implementations (e.g. [minimatch][2], [micromatch][3])
  work differently, matching 1 or more character (but not 0).

This commit "fixes" the minimal glob support in
`@angular/service-worker` to allow `*` to also match 0 characters.

[1]: https://en.wikipedia.org/wiki/Glob_%28programming%29
[2]: https://www.npmjs.com/package/minimatch
[3]: https://www.npmjs.com/package/micromatch

PR Close #23339

packages/service-worker/config/src/glob.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-const WILD_SINGLE = '[^\\/]+';
+const WILD_SINGLE = '[^\\/]*';
 const WILD_OPEN = '(?:.+\\/)?';
 
 const TO_ESCAPE = [