clean up mock endpoints

[isabeleliassen]

• remove/mock part of API and associated resources dependency: #109

[jusdino]

After we are fully migrated over to the /v1 api, we will need to remove:

• all /mock and /v0 paths from the API, all associated lambdas
• The mock_bucket: true support from the BulkUploadsBucket construct
• the license-data lambda package
• the delete-objects lambda package
• the mock/deprecated data resources from the PersistentStack

Note that this may have to be done in two waves to work through cross-stack dependencies:

• api updates first to remove data resource dependencies from the API
• data resources second

[landonshumway-ia]

I have broken this ticket up into two parts, as it will require two changes that must be separately deployed all the way through the production environment to avoid issues with cross-stack dependencies. Part 1 of this effort is now in #338

This ticket will be used to track part 2, which involves cleaning up the mock resources in the Persistent stack.