Add certificate_map to compute_target_ssl_proxy

[modular-magician]

Add certificate_map option to compute_target_ssl_proxy in order to support new certificate-manager (with wildcard support).

Similar PR: GoogleCloudPlatform/magic-modules#5991

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compute: added `certificate_map` to `compute_target_ssl_proxy` resource

Derived from GoogleCloudPlatform/magic-modules#6443