Test against MongoDB 4 by default on 10.10+ (drop 3.4)

Since NXP-25620 and according to nxdoc/compatibility-matrix, MondoDB 4 is the officially supported version and support of 3.4 is dropped.

The new Code-Driven-Tools paradigm requires the test to provide its requirements and environment (as in NXP-25620) but there remains old style tests relying on infrastructure, default environment, database embedded in the Jenkins slave.
TODO:

• Find and highlight those cases, determine if they can be replaced.
• If still used and not quickly replace-able, then update all installs of and references to a v4 database.
• If unused, then remove the old database.
• Update related documentation. See https://nuxeowiki.atlassian.net/wiki/dosearchsite.action?cql=siteSearch+~+%22multidb%22&queryString=multidb
• Before removing resources, check that they have been already versioned for NXP 9.10.

NXP-25620 should have been used for commits on pipeline files in the Platform code base and NXBT-2709 .for those on the infrastructure. Pay attention to the versions and consider doing backports when relevant.