fix(utils): make slugify replace all whitespace (#96777)

When attempting to use our `slugify` util, I realized that it only ever
replaced the first whitespace character with `-`.

This PR adjusts `slugify` so it more closely matches the built-in Django
`slugify` function. Thankfully this is really only used in forms for
creating new orgs/projects/teams/monitors, so the impact is minimal.

Pinging @malwilley as the most recent person to modify this function
(albeit years ago)

Author: natemoo-re

static/app/utils/slugify.spec.tsx

@@ -5,10 +5,14 @@ describe('slugify', function () {
     expect(slugify('STOPYELLING')).toBe('stopyelling');
   });
 
-  it('replaces spaces with a hyphen', function () {
+  it('replaces space with a hyphen', function () {
     expect(slugify('STOP YELLING')).toBe('stop-yelling');
   });
 
+  it('replaces all spaces with a hyphen', function () {
+    expect(slugify('STOP YELLING AT ME')).toBe('stop-yelling-at-me');
+  });
+
   it('replaces accented characters', function () {
     expect(slugify('Áá')).toBe('aa');
   });

static/app/utils/slugify.tsx

@@ -9,6 +9,6 @@ export default function slugify(str: string): string {
   return str
     .normalize('NFKD') // Converts accents/ligatures/etc to latin alphabet
     .toLowerCase()
-    .replace(' ', '-')
-    .replace(/[^a-z0-9-_]/g, ''); // Remove all invalid characters
+    .replace(/[^a-z0-9_\s-]/g, '') // Remove all invalid characters
+    .replace(/[-\s]+/g, '-'); // Replace multiple spaces or hyphens with a single hyphen
 }