478 refactor v1 workflows activities endpoint

[PeopleMakeCulture]

Description

Fixes #478

Type of change

• Bug fix (non-breaking change which fixes an issue)

• fixes bug in v1/workflows/activities endpoint documented in /v1/workflows/activities endpoint adds empty keys with null values to mongo #478
• NOTE: this v1 endpoint will be removed in a future PR

• New feature (non-breaking change which adds functionality)

• introduces NEW workflows/activities endpoint that duplicates the functionality of the above

• This change requires a documentation update

• Add "Deprecated" note to v1
• Add workflows/activities documentation

How Has This Been Tested?

Used example in #478 for added test_submit_workflow_activities test.

Checklist:

• My code follows the style guidelines of this project (have you run black nmdc_runtime/?)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (in docs/ and in https://github.com/microbiomedata/NMDC_documentation/?) no need; this is a fix
• I have added tests that prove my fix is effective or that my feature works, incl. considering downstream usage (e.g. https://github.com/microbiomedata/notebook_hackathons) if applicable.
• New and existing unit and functional tests pass locally with my changes (make up-test && make test-run)

[dwinston]

will touch up a couple things (noted in review) that aren't blocking.

[dwinston]

why the leading ~? I'll change to POST /workflows/activities.

[dwinston]

not PR-blocking

[dwinston]

more accurately, use same logic as the dagster job for json:submit endpoint.

[dwinston]

not PR-blocking

[dwinston]

added test