Add smaller bucket sizes for workqueue metrics

[gauravkghildiyal]

Some events related to NEG workqueues take subsecond time for completion. Having more buckets within the 1 second duration should help estimate us better if the NEG Controller is working as expected -- even a slight increase on these <1 second processing times could drastically effect the overall performance when the NEG Controller is managing too many events.

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[gauravkghildiyal]

/assign @swetharepakula

[swetharepakula]

This seems reasonable to me. Cezary can you take a look and confirm this will not negatively affect existing workqueue metrics for l4.

\assign @cezarygerard

[cezarygerard]

it looks good

/lgtm

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This pull-request has been approved by: cezarygerard, gauravkghildiyal

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