Fix handling of SSL certificates in external load balancer modules #8714

Job	Run time
compute-matrix	1s
setup-tf-providers (terraform, 1.10.2)	59s
setup-tf-providers (tofu, 1.8.0)	23s
blueprints	13s
examples-blueprints	2m 28s
examples-modules (terraform, 1.10.2)	11m 5s
fast	1m 15s
examples-modules (tofu, 1.8.0)	11m 8s
schemas	24s
modules (terraform, 1.10.2)	1m 16s
modules (tofu, 1.8.0)	1m 19s
	30m 31s

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