fixes for test execution

[fmigneault]

Changes

• Add more explicit PackageException error messages with contextual details when a CWL file reference cannot be resolved correctly.
• Ensure all generated test-webapps use the same test database collection.

Fixes:

• Fix resolution of CWL file from references that do not provide a known Content-Type that can represent CWL contents. This can occur when deploying a builtin Process from the local file reference, which does not generate a request and, therefore, no Content-Type. This can occur also for servers that incorrectly or simply do not report their response Content-Type header.
• Fix resolution of file reference with explicit CWL or YAML extensions when Content-Type is not reported or is indicated as plain/text.
• Fix invalid resolution of builtin Process that could load the optional JSON or YAML payload file intended to provide additional Process definition details, instead of the expected CWL for the package definition.

[codecov[bot]]

Codecov Report

Merging #477 (01d0b06) into master (60c9f3d) will decrease coverage by 0.03%. The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master     #477      +/-   ##
==========================================
- Coverage   82.97%   82.93%   -0.04%     
==========================================
  Files          77       77              
  Lines       15525    15530       +5     
  Branches     2402     2403       +1     
==========================================
- Hits        12882    12880       -2     
- Misses       1942     1947       +5     
- Partials      701      703       +2     

Impacted Files	Coverage Δ
weaver/processes/wps_package.py	78.38% <45.45%> (-0.36%)	:arrow_down:
weaver/processes/builtin/__init__.py	84.87% <100.00%> (ø)
weaver/database/mongodb.py	88.00% <0.00%> (-4.00%)	:arrow_down:

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