Automatic merge from submit-queue (batch tested with PRs 46681, 46786, 46264, 46680, 46805)

Enable Dialer on the Aggregator

Centralize the creation of the dialer during startup.
Have the dialer then passed in to both APIServer and Aggregator.
Aggregator the uses the dialer as its Transport base.

**What this PR does / why we need it**:Enables the Aggregator to use the Dialer/SSHTunneler to connect to the user-apiserver.

**Which issue this PR fixes** : fixes ##46679

**Special notes for your reviewer**:

**Release note**: None