Fixes subscribeType metadata field not being respected for Pulsar pub sub

[elena-kolevska]

• Fixes subscribeType metadata field not being respected
• Fixes bug not allowing to connect to remote endpoints starting with pulsar:// or pulsar+ssl://

Currently, we have the subscribeType configuration field documented but not respected and the same field as subscription metadata is respected, but not documented.

var defaultSubscription = &common.Subscription{
		PubsubName: pubsubName,
		Topic:      topicName,
		Route:      "/orders",
		Metadata:   map[string]string{"subscribeType": "key_shared"},
	}

This PR uses the value in the configuration as default and overrides with the subscription metadata if one is set.

Issue reference

#3601

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]

[yaron2]

The metadata YAML file needs to be updated

[yaron2]

Build check is failing

[elena-kolevska]

Build check is failing

Yeah, flaky test after merging master in, sorry. It's good now 🙏 .