chore: Remove backfill script (already applied manually) #5714

Job	Run time
build-and-check	2m 37s
test-integration-packages/internal	1m 20s
test-integration-packages/billing	1m 27s
test-integration-sdk	48s
test-integration-common	48s
test-integration-packages/agent-runtime	42s
test-integration-cli	47s
test-cli	49s
test-packages/agent-runtime	48s
test-integration-web	40s
test-.agents	48s
test-common	49s
test-packages/internal	54s
test-sdk	41s
test-packages/billing	45s
test-web	41s
	15m 24s

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