Feature: Upgrade prefect 1.* to 2.13

[annshress]

Upgrade the prefect version from legacy (1.x) to current (2.x)

Changes

• Refactors the flows and flow tests

Breaking:

• Flows are invoked from api using deployment ids, and the apis follow REST rather than GraphQL

This PR doesn't introduce any:

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

This PR contains valid:

• tests

[philipmac]

it seems strange they don't have a helper like on_start - (we could put the call into the API there)

[github-actions]

Coverage report

The coverage rate went from 63.93% to 64.03% ⬆️
The branch rate is 46%.

59.37% of new lines are covered.

Diff Coverage details (click to unfold)

em_workflows/config.py

75% of new lines are covered (79.59% of the complete file).
Missing lines: 41, 42

em_workflows/czi/flow.py

75% of new lines are covered (23.85% of the complete file).
Missing lines: 158

em_workflows/dm_conversion/flow.py

70% of new lines are covered (89.36% of the complete file).
Missing lines: 68, 136, 175

em_workflows/file_path.py

70% of new lines are covered (81.34% of the complete file).
Missing lines: 118, 261, 266

em_workflows/utils/utils.py

53.12% of new lines are covered (59.63% of the complete file).
Missing lines: 283, 354, 413, 423, 439, 449, 450, 451, 452, 456, 459, 460, 461, 462, 463, 464, 465, 524, 528, 531, 532, 533, 534, 535, 536, 537, 538, 615, 629, 631