Default service_control_enable_api_key_uuid_reporting to true

[paulhong01]

• Consider that eventually we will remove this flag entirely, setting service_control_enable_api_key_uuid_reporting to true by default will make it easier to clean up in the future, comparing setting ServiceControlEnableApiKeyUidReporting flag (since this needs to update a few unit tests/integration tests)
• I manually verified the new image again.

[paulhong01]

/retest-required

[paulhong01]

/retest-required

[google-oss-prow]

@paulhong01: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ESPv2-presubmit-tsan	8a63776	link	true	/test ESPv2-presubmit-tsan
ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore	8a63776	link	true	/test ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore
ESPv2-presubmit-asan	8a63776	link	true	/test ESPv2-presubmit-asan

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Elliot-xq, paulhong01, shuoyang2016

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