Upgrades - duplication protection and tests

[abradley60]

Large PR with many changes...

• Additional protection against duplication. i.e. check file exists just before uploading
• Adding clarity to logic for burst_id_list_to_process. i.e. if a burst_id_list is passed in and some already exist, burst_id_list_to_process will only include the missing bursts
• Adding exit codes:
  • 101 : The required static layers for linking do not exist
• Changing logic so the s3 bucket can still be queried if credentials aren't passed
• Adding early tests
  • test-aws-cli -> requires credentials to be set
  • test-aws-functions -> unit testing for individual functions
  • test-full-aws-docker-run -> end to end build and test of the image, should be run before releasing
• removing interpolated_dem from the required static layers
• Improving logic to just get DEM for required burst area
• Adding gamma0 to the backscatter assets. i.e HH.tf -> HH_gamma0.tif
• spliting logic into an odc specific file for odc and s3 upload path related things
• Updating s3 paths
• Fixing burst geometries in metadata

[geoscience-aman]

Thanks for the tests and everything 🙏

[caitlinadams]

Thanks for all of this work, @abradley60 -- it's fantastic to have more tests included. I've made some minor suggestions throughout, see what you think.

[caitlinadams]

Thanks for making the changes!