feat(workflow_engine): Setup the Task for process_workflow_updates

[saponifi3d]

Description

• Create a celery task namespace for the workflow engine tasks
• Create a task for processing an activity in the workflow_engine -- this will allow us to create a celery task to async execute process workflows when the issue platform creates an activity

In the code I mention there being a follow-up PR: https://github.com/getsentry/sentry/pull/93580 is the initial PR to support the Activity / Group models.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/workflow_engine/tasks.py	95.45%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #93553      +/-   ##
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+ Coverage   88.00%   88.04%   +0.03%     
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  Files       10322    10340      +18     
  Lines      595043   596685    +1642     
  Branches    23141    23141              
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+ Hits       523691   525355    +1664     
+ Misses      70859    70837      -22     
  Partials      493      493