feat: As a user, I want to use ApisixTls as client_cert

[grootTwig]

Description

feat: As a user, I want to set ApisixUpstraen ssl with ApisixTls, so that one tls can be used by many upstreams, is there any plan to support that? As apisix already supported tls.client_cert_id in upstream.

[github-actions]

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