chore(ci): Remove Trivy Action

[andreyvelich]

As per our discussion with the security team, we suggested to remove Trivy action from our CI at the moment.

/assign @akshaychitneni @astefanutti @tenzen-y @kramaranya @Fiona-Waters @franciscojavierarceo @juliusvonkohout @thesuperzapper

[franciscojavierarceo]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: franciscojavierarceo
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[andreyvelich]

/cherry-pick release-0.19

[google-oss-robot]

@andreyvelich: new pull request created: #2646

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In response to this:

/cherry-pick release-0.19

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