Use closest year available for each map

[hannah-rae]

For maps that have more than one year available, we use the closest year to the test set year.

TODO: update results for all map notebooks

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[adebowaledaniel]

Updates: compare_covermaps:

• the get_test_years gets rid of the TEST_CODE, per Ivan’s review
• Added the year to the names of the Togo, Rwanda, and Uganda test files to match the name convention. (I will update the actual files on DVC later.

These changes were made to ensure the year parameter is maintained in the extract_test and to prevent any errors in its use case in TestCovermaps.

Demo-notebook (to be deleted before merge):

• Without a range filter of maps, I observe that the extract_year only selects the nearest year from maps with multiple years_covered and updates the ee_asset string. For other single-year maps, we could select maps with the exact test year or those within a range of ±1 year of the test year. (The latter is implemented in the notebook). The analysis will focus on maps produced closest to the test set year. This might be a use case specific to area estimates; however, let me know what you think about this for intercomparison @hannah-rae. I will include it in the area estimates notebook in a separate PR.