Improve AlertViewer UI/UX

[kpuriIpac]

SUIT PR: lsst/suit#84

• Remove Job Monitor tab for alert viewer
• Default tab when you hit /alertviewer is now the Alert tab (/alertviewer/upload) instead of the Results tab.
• Simplified Results (landing page) text for AlertViewer
  • required a small custom component to modify the bottom section of the LandingPage, I could have probably done this through slotProps, but it was proving to be trickier (was affecting Euclid/Spherex) and LandingPage is used in several places so I thought it was best to create a simple custom component instead in this case
  • And the changes in RoutedApp are to support being able to call LandingPage as well (to have more control over customizing it)

Testing:

• Firefly's AlertViewer: https://fireflydev.ipac.caltech.edu/alert-viewer-changes/firefly/alertviewer
• SUIT's AlertViewer: https://enable-alert-viewer.irsakubedev.ipac.caltech.edu/suit/alertviewer
  • Ensure you're routed to Alert tab directly. Inspect the Results tab (landing page) text.
  • Checkout this branch locally if you want to test submitting Alert IDs (sample IDs: 170112073844916273, 170059278837088375)
  • URL API should still work (if trying on the test builds above, you should get a missing/invalid token error, locally it should take you to the results tab with results loaded).