add cilium_hubble_event_buffer_capacity & cilium_hubble_event_queue_size vars

[pedro-peter]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
On loaded k8s clusters, cilium hubble can drop events. This can been seen in the hubble logs with messages: hubble events queue is full; dropping messages

Which issue(s) this PR fixes:

Fixes #10942

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

add cilium_hubble_event_buffer_capacity & cilium_hubble_event_queue_size vars

[k8s-ci-robot]

Hi @pedro-peter. Thanks for your PR.

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[cyclinder]

/ok-to-test

[VannTen]

Just nit picks.

[snowhanse]

Is this good to merge?

[snowhanse]

bump

[cyclinder]

thanks!

/lgtm

[pedro-peter]

/assign @yankay

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/lifecycle stale

[yankay]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cyclinder, pedro-peter, yankay

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