fix the empty result when the value of an output field contains a dash/slash + trim prefix with the timestamp and priority for the output

[Issif]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area build

/area tests

What this PR does / why we need it:

An user noticed empty result when we search for an output field value with a / or -. It was fixed for the tags and hostnames not for other fields.

Moreover, I added a regexp to remove for the output field the timestamp + priority, it's a redundant info in the event board. It also so save some space.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

These changes will imply to flush all data, the schema in redisearch must be replaced.

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fjogeleit, Issif

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/falcosecurity/falcosidekick-ui/blob/master/OWNERS)~~ [Issif,fjogeleit] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[poiana]

LGTM label has been added.

Git tree hash: 4642ea92b0834542f2f53467b6d02bfd4e6bb3e1