Extracting out reused variable
Adding estimateSize functionality

Needs tests and refactoring
Interim commit. Changing estimateSize to estimateSizeForLayer
Finish test and make action require a layerId
Updating name of action in SecurityFilters
Extracting out reused variable
Adding estimateSize functionality

Needs tests and refactoring
Interim commit. Changing estimateSize to estimateSizeForLayer
Finish test and make action require a layerId
Updating name of action in SecurityFilters
Merge branch 'estimate_download_size_server_side' of https://github.com/aodn/aodn-portal into estimate_download_size_server_side_rebased
Removing irrelevant data from test data to make desired behvaiour more obvious
Merge pull request #792 from aodn/estimate_download_size_server_side

Estimate download size server side