NETOBSERV-2021 Improve filtering UX

[jpinsonneau]

Description

Dependencies

n/a

Checklist

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• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
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[openshift-ci]

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[openshift-ci]

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[openshift-merge-robot]

PR needs rebase.

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