Fix #3592. Bad Input Error if pbjs s2s config contains alias configuration for a disabled adapter

[zxPhoenix]

🔧 Type of changes

• new bid adapter
• bid adapter update
• new feature
• new analytics adapter
• new module
• module update
• bugfix
• documentation
• configuration
• dependency update
• tech debt (test coverage, refactorings, etc.)

✨ What's the context?

Fix issue #3592. Bad Input Error if pbjs s2s config contains alias configuration for a disabled adapter.
Move unknown bidder and bidder is deactivated errors to warnings level.
Add unknown_bidder and deactivated_bidder metrics

🧠 Rationale behind the change

Why did you choose to make these changes? Were there any trade-offs you had to consider?

🔎 New Bid Adapter Checklist

• verify email contact works
• NO fully dynamic hostnames
• geographic host parameters are NOT required
• direct use of HTTP is prohibited - implement an existing Bidder interface that will do all the job
• if the ORTB is just forwarded to the endpoint, use the generic adapter - define the new adapter as the alias of the generic adapter
• cover an adapter configuration with an integration test

🧪 Test plan

Changes are covered by unit tests.

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code?
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes?