API version number displayed should reflect EJAM version

This same issue is also listed as https://github.com/Public-Environmental-Data-Partners/EJAM/issues/580

API shows a version number in the API documentation page. That number should be based on whatever EJAM package version the API is currently using, whether stored in EJAM_VERSION environment variable or stored in packageVersion("EJAM") determined at the time the API starts to run.

This is fixed in the draft API rest controller that is in the EJAM repo by https://github.com/Public-Environmental-Data-Partners/EJAM/pull/579
but that needs to also be done in the version of the API rest controller / plumber code that is used by the EJAM-API repo which the EJAM has a copy of but those are separate files in separate repositories, and need to be kept in sync manually for now via PRs, etc.