chore(ui): Update language on nav labels (#95340)

Update tooltips so they don't use the same exact wording, hopefully that
clarifies a few things. Also `Last` -> `Latest`

<img width="257" height="115" alt="image"
src="https://github.com/user-attachments/assets/4d292114-662b-409f-a91c-3c0bced3ba8f"
/>


<img width="429" height="100" alt="image"
src="https://github.com/user-attachments/assets/5e05b38a-0b53-4245-acde-3d6368e59499"
/>

Author: leeandher

static/app/views/issueDetails/streamline/issueDetailsEventNavigation.spec.tsx

@@ -64,7 +64,7 @@ describe('IssueDetailsEventNavigation', () => {
         deprecatedRouterMocks: true,
       });
 
-      await userEvent.click(await screen.findByRole('tab', {name: 'Last'}));
+      await userEvent.click(await screen.findByRole('tab', {name: 'Latest'}));
 
       expect(router.push).toHaveBeenCalledWith({
         pathname: '/organizations/org-slug/issues/group-id/events/latest/',

static/app/views/issueDetails/streamline/issueDetailsEventNavigation.tsx

@@ -94,14 +94,14 @@ export function IssueDetailsEventNavigation({
   const EventNavLabels = {
     [EventNavOptions.RECOMMENDED]: isSmallScreen ? t('Rec.') : t('Recommended'),
     [EventNavOptions.OLDEST]: t('First'),
-    [EventNavOptions.LATEST]: t('Last'),
+    [EventNavOptions.LATEST]: t('Latest'),
     [EventNavOptions.CUSTOM]: t('Custom'),
   };
 
   const EventNavTooltips = {
     [EventNavOptions.RECOMMENDED]: t('Recent event with richer content'),
-    [EventNavOptions.OLDEST]: t('First event matching filters'),
-    [EventNavOptions.LATEST]: t('Last event matching filters'),
+    [EventNavOptions.OLDEST]: t('Earliest event matching filters'),
+    [EventNavOptions.LATEST]: t('Newest event matching filters'),
   };
 
   const onTabChange = (tabKey: typeof selectedOption) => {