Add view_timeline icon to the Checks API

Google-Bug-Id: b/366016487
Release-Notes: skip
Change-Id: I5c1ead6a2442526d84d56db910be4812c6fd2ae6

polygerrit-ui/app/api/checks.ts

diff --git a/polygerrit-ui/app/api/checks.ts b/polygerrit-ui/app/api/checks.ts
index 7dcc2b8..c2afebb 100644
--- a/polygerrit-ui/app/api/checks.ts
+++ b/polygerrit-ui/app/api/checks.ts
@@ -530,4 +530,5 @@
   REPORT_BUG = 'report_bug',
   CODE = 'code',
   FILE_PRESENT = 'file_present',
+  VIEW_TIMELINE = 'view_timeline',
 }