TEAMNADO-8465: Add cert-manager for rhsm-api-proxy

[Bhakti1309]

Use certificate created by cert manager.

[app-sre-bot]

Can one of the admins verify this patch?

[hseljenes]

/ok-to-test

[hseljenes]

Deploying ephemeral failed with
Error: loading initial config: loading new config: loading http app module: provision http: server proxy: setting up route handlers: route 0: loading handler modules: position 2: loading module 'reverse_proxy': provision http.handlers.reverse_proxy: loading transport: loading module 'http': provision http.reverse_proxy.transport.http: making TLS client config: loading client certificate key pair: open /tls/keypair.pem: no such file or directory
Two questions:

1. Should keypair.pem still exist in ephemeral? This is what we expected to work in prod, right?
2. Do we need to update an ephemeral specific config in the namespaces?

[hseljenes]

/retest

[Bhakti1309]

/retest

[hseljenes]

/retest

[hseljenes]

/retest