Update secondary CTAs on /device-management and /linux-management to match homepage hero (#45123)

## Summary

- Replace "See Fleet in action" video buttons (with play icon and "3
mins" label) on `/device-management` and `/linux-management` with "Join
a workshop" `<animated-arrow-button>` linking to `/gitops-workshop`
- Matches the homepage hero secondary CTA style established in #45122
for `/replace-jamf`

## Changes

- `website/views/pages/device-management.ejs` — replaced video-button
CTA with animated-arrow-button
- `website/views/pages/landing-pages/linux-management.ejs` — replaced
video-button CTA with animated-arrow-button

## Notes

Searched the entire website codebase for all instances. Only
`/device-management` and `/linux-management` had the matching "See Fleet
in action" video modal CTA pattern. Other uses of `clickOpenVideoModal`
(transparency page's "Why is Fleet on my computer?", calendar banner,
customer testimonials) are different CTAs and were left unchanged.

---

Built for [Mike
McNeil](https://fleetdm.slack.com/archives/D0AFASLRHNU/p1778477147893939?thread_ts=1778225078.313209&cid=D0AFASLRHNU)
by [Kilo for Slack](https://kilo.ai/slack)

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>

website/views/pages/device-management.ejs

@@ -25,7 +25,7 @@
         </div>
         <div purpose="button-row" class="d-flex justify-content-start align-items-center">
               <a purpose="cta-button" href="/contact">Get a demo</a>
-              <a purpose="video-button"  @click="clickOpenVideoModal('fleet-in-three-minutes')"><img alt="Play" class="d-inline" src="/images/icon-play-video-32x32@2x.png">See Fleet in action <span>3 mins</span></a>
+              <animated-arrow-button href="/gitops-workshop">Join a workshop</animated-arrow-button>
             </div>
       </div>
       <logo-carousel></logo-carousel>

website/views/pages/landing-pages/linux-management.ejs

@@ -12,7 +12,7 @@
           </div>
           <div purpose="button-row" class="d-flex justify-content-center align-items-center">
             <a purpose="cta-button" class="btn btn-primary" href="/whitepapers/it-leaders-guide-to-linux-device-management">Read the whitepaper</a>
-            <a purpose="video-button" @click="clickOpenVideoModal('fleet-in-three-minutes')"><img alt="Play" class="d-inline" src="/images/icon-play-video-32x32@2x.png">See Fleet in action <span>3 mins</span></a>
+            <animated-arrow-button href="/gitops-workshop">Join a workshop</animated-arrow-button>
           </div>
         </div>
       </div><%/* landing-page-hero */%>