Greenbids fix geolookup: host and fetch GCS + mock dbReader UT

[EvgeniiMunin]

🔧 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?

• GreenBids module: Ignore broken tests #3624

🧠 Rationale behind the change

• We host the GeoLite2-Country.mmdb in Greenbids GCS bucket instead of open source URL: gs://greenbids-europe-west1-prebid-server-staging/GeoLite2-Country.mmdb
• We mock the dbReader in unit test instead of loading real mmdb
• We add the logic to fallback to getCountry(ip) only in case if Device::getGeo is null (geoLookupEnabled is false in GeoLocationServiceWrapper)

🔎 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

How do you know the changes are safe to ship to production?

🏎 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?

[EvgeniiMunin]

Groovy IT is failing

Error:  Tests run: 38, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 21.95 s <<< FAILURE! -- in org.prebid.server.functional.tests.module.responsecorrenction.ResponseCorrectionSpec
Error:  org.prebid.server.functional.tests.module.responsecorrenction.ResponseCorrectionSpec.PBS should modify meta.mediaType and type for original response and also emit logs when response contains native meta.mediaType and adm without asset -- Time elapsed: 0.286 s <<< FAILURE!

I will push an empty commit to see if it is a flaky one