UI: filter log lines that do _not_ contain a string

# Summary

when clicking on logs of a completed workflow, there is currently a string filter for lines including that string. But no button to allow viewing log lines NOT matching that string...argocd has this feature with ! button (https://github.com/argoproj/argo-cd/blob/d17aafd19a465fb9992d8189381adc3bdd488ead/ui/src/app/applications/components/pod-logs-viewer/log-message-filter.tsx#L6)

# Use Cases

filter out some useless/repeating lines from log

version 3.3.9

Start by locating the completed-workflow log viewer and its existing string-filter control. Use the linked Argo CD filter as a behavior reference, then verify that users can toggle exclusion and that the displayed lines omit the selected string.

Written by the indexing model from the issue text.