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

[AntoxaAntoxic]

this change is not covered by the unit tests

[EvgeniiMunin]

After checking Locale docs, the alpha3 code is not convertable to countryName via getCountry (only works for alpha2).

So need to use CountryCodeMapper mapToAlpha2 to convert alpha3 -> alpha2 and then via Locale alpha2 -> countryName.

private String resolveAlpha2CountryCode(Device device) {
        return Optional.ofNullable(device)
                .map(Device::getGeo)
                .map(Geo::getCountry)
                .map(countryCodeMapper::mapToAlpha2)
                .orElse(null);
    }

[AntoxaAntoxic]

sure, if you need it

[EvgeniiMunin]

Also need to not forget to remove .eventually(v -> tmpFile.close()) downloadFile and find workaround for ensuring file closing

As we discussed on Slack on the current state the usage of .eventually(v -> tmpFile.close()) leads to exception on file closing
java.lang.IllegalStateException: File handle is closed as it looks like pipeTo closes file automatically. Manual closing is recommended but leads to exception.

As the current objective of this PR is to fix the PBS codebase I propose to find the solution in the PR #3596

[AntoxaAntoxic]

please use getters

[AntoxaAntoxic]

sure, if you need it