Small 2D fix and refactor BRT

[annshress]

Changes

• Add notify api running calls as soon as the flow runs start
• Remove subflow for small dm conversion flow
• Revert Completion/Failed to original success/error api calls on notify-api-completion
• Refactor BRT flow: combine tasks

This PR doesn't introduce any:

• [x] Binary files
• [ ] Temporary files, auto-generated files
• [x] Secret keys
• [ ] Local debugging print statements
• [ ] Unwanted comments (e.g: # Gets user from environment for code os.environ['user'] )

This PR contains valid:

• [ ] tests

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
em_workflows
file_path.py					215-216
em_workflows/dm_conversion
flow.py
em_workflows/lrg_2d_rgb
flow.py
em_workflows/utils
neuroglancer.py					38-67, 130-135
utils.py					351-352, 447, 524-525, 534-547, 587
Project Total

This report was generated by python-coverage-comment-action