add support for e2e latency for dynamic mode and adoption rate metrics

[minj131]

What this PR does / why we need it:

This adds logic to support e2e latency for dynamic mode and dynamic backend mode files.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @minj131. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nnmin-aws]

/ok-to-test

[nnmin-aws]

/re-test

[nnmin-aws]

/retest

[nnmin-aws]

/lgtm

[jyotimahapatra]

/ok-to-test

[nnmin-aws]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jyotimahapatra, minj131

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/aws-iam-authenticator/blob/master/OWNERS)~~ [jyotimahapatra] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[nnmin-aws]

/lgtm