Send PIPs to Archivematica as BagIt bags

[djjuhasz]

Fixes #805

• Remove the bundle activity from the AM processing workflow
• Change the package type to "zipped bag" when starting a transfer via
  the Archivematica API
• Bag the PIP before sending it to Archivematica (if it's not already a
  bag)
• Add a "TransferSourcePath" config value to specify the API path to the
  Transfer Source directory where PIPs are uploaded

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 53.15%. Comparing base (17ae315) to head (6471106).
Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/workflow/processing.go	87.09%	4 Missing and 4 partials ⚠️
cmd/enduro-am-worker/main.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1007      +/-   ##
==========================================
+ Coverage   53.12%   53.15%   +0.03%     
==========================================
  Files         102      102              
  Lines        5835     5856      +21     
==========================================
+ Hits         3100     3113      +13     
- Misses       2478     2484       +6     
- Partials      257      259       +2     

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[jraddaoui]

Thanks @djjuhasz, this looks great!

Some minor comments below and a bigger request after seeing the changes from both PRs (more related to #999 than to this one).

We decided at some point that preprocessing child workflows MUST return a valid Bag. If a preprocessing child workflow has been executed and the package is not identified as a Bag, we should fail the workflow instead of making it a Bag.

Check the following diagram that @sallain wrote a while ago, it doesn't include the identify activity but it tries to represent that, if a child workflow was run, we must have a valid Bag.

#805 (comment)

[djjuhasz]

@jraddaoui okay, I've addressed your comments and the workflow will now stop if preprocessing returns a SIP that is not a bag. I also had to fight with prettier a bit about formatting markdown, and made some changes to the preprocessing_test script to get the preprocessing test working and for my sanity trying to figure out where preservation tasks are being created and completed.

I'll squash all the changes before merging.

[jraddaoui]

Thanks @djjuhasz!