Rename neg metrics collector and update usage for fake metrics collector in test.

[sawsa307]

• Rename NEG metrics collector because it collects more than syncer metrics now.
• FakeNEGControllerMetrics should be used for testing.

/assign @swetharepakula

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This pull-request has been approved by: sawsa307
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[bowei]

/ok-to-test

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/lifecycle stale

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PR needs rebase.

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