feat(notif-builder): Preview for slack

[leeandher]

Turns out the blockkit builder is a privledged link, so in case devs dont have a slack app to test with, there is now still a simple preview

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #101164   +/-   ##
========================================
  Coverage   81.05%    81.05%           
========================================
  Files        8676      8676           
  Lines      384918    384912    -6     
  Branches    24319     24319           
========================================
- Hits       311977    311976    -1     
+ Misses      72582     72577    -5     
  Partials      359       359           

[Christinarlong]

do you really need a bot to access that link :bruh: . I'm p sure I was able to access w/o a bot or maybe you need certain perms 🫠

[leeandher]

do you really need a bot to access that link :bruh: . I'm p sure I was able to access w/o a bot or maybe you need certain perms 🫠

Hmm, I think I misunderstood -- You can access block-kit builder without an app, but you do need access to a slack workspace and to be signed in in the browser. So in theory any sentry employee should be ok as long as they sign in to the sentry slack workspace in their browser, but I guess this can save them a click. Either way a nice to have! I wanna add it for MSTeams as well just for dev ex purposes