[WIP] Add source files to SC service config

[nareddyt]

Just checking service config sizes.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nareddyt

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[google-oss-robot]

@nareddyt: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ESPv2-cloud-run-e2e-cloud-function-http-bookstore	a614518	link	/test ESPv2-cloud-run-e2e-cloud-function-http-bookstore
ESPv2-cloud-run-e2e-app-engine-http-bookstore	a614518	link	/test ESPv2-cloud-run-e2e-app-engine-http-bookstore
ESPv2-cloud-run-e2e-cloud-run-grpc-echo	a614518	link	/test ESPv2-cloud-run-e2e-cloud-run-grpc-echo
ESPv2-cloud-run-e2e-cloud-run-http-bookstore	a614518	link	/test ESPv2-cloud-run-e2e-cloud-run-http-bookstore
ESPv2-gke-e2e-grpc-echo-managed	a614518	link	/test ESPv2-gke-e2e-grpc-echo-managed

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