Alerting: Remove start page of upgrade preview
Alerting upgrade page will now always show the summary table even before
upgrading any alerts or notification channels. There a few reasons for this:
- The information on the start page is redundant as it's now contained in the
documentation.
- Previously, if some unexpected issue prevented performing a full upgrade, a
user would have limited to no means to using the preview tool to help fix the
problem. This is because you could not see the summary table until the full
upgrade was performed at least once. Now, you can upgrade individual alerts and
notification channels from the beginning.
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