--single-process inherit reqs & hints; sub-workflows

[mr-c]

Fixes #1531
Fixes #1530

• add test with a subworkflow and --single-process targetting a step of that sub-workflow, confirming that a hint or requirement from the grandparent workflow is inherited correctly.

[codecov]

Codecov Report

Merging #1558 (4af58ab) into main (8720230) will decrease coverage by 0.08%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##             main    #1558      +/-   ##
==========================================
- Coverage   66.07%   65.99%   -0.09%     
==========================================
  Files          91       91              
  Lines       16155    16281     +126     
  Branches     4172     4218      +46     
==========================================
+ Hits        10674    10744      +70     
- Misses       4348     4389      +41     
- Partials     1133     1148      +15     

Impacted Files	Coverage Δ
cwltool/argparser.py	89.77% <ø> (ø)
cwltool/builder.py	69.59% <ø> (-0.75%)	⬇️
cwltool/cwlviewer.py	98.85% <ø> (-0.02%)	⬇️
cwltool/main.py	64.86% <57.62%> (+2.81%)	⬆️
cwltool/software_requirements.py	67.53% <66.66%> (+0.42%)	⬆️
cwltool/subgraph.py	79.01% <74.50%> (-0.10%)	⬇️
cwltool/context.py	97.29% <100.00%> (ø)
cwltool/job.py	76.92% <100.00%> (ø)
cwltool/process.py	85.40% <100.00%> (ø)
cwltool/utils.py	79.70% <100.00%> (+0.94%)	⬆️
... and 13 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8720230...4af58ab. Read the comment docs.

[lgtm-com]

This pull request introduces 2 alerts when merging 8622080 into 8720230 - view on LGTM.com

new alerts:

• 1 for Unused import
• 1 for Module-level cyclic import

[mr-c]

Release test failure appears to be related to common-workflow-language/schema_salad#465

[lgtm-com]

This pull request introduces 4 alerts and fixes 1 when merging 42d2b91 into 8720230 - view on LGTM.com

new alerts:

• 4 for Module-level cyclic import

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 4 alerts and fixes 1 when merging 3c1595f into 8720230 - view on LGTM.com

new alerts:

• 4 for Module-level cyclic import

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging 3ea5b06 into 8720230 - view on LGTM.com

new alerts:

• 3 for Module-level cyclic import

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging a1159b4 into 8720230 - view on LGTM.com

new alerts:

• 3 for Module-level cyclic import

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 3 alerts and fixes 5 when merging 4af58ab into 8720230 - view on LGTM.com

new alerts:

• 3 for Module-level cyclic import

fixed alerts:

• 4 for Module-level cyclic import
• 1 for Unused import