fix: LSDV-5289-1: Load stats recalculation function from string, call after update task states

[jombooth]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

(link to issue, supportive screenshots etc.)

Attempt 2 at fixing deadlocks. Previously we were performing stats recalculation in parallel with updating task states in LSE.

What does this fix?

(if this is a bug fix)

What is the new behavior?

(if this is a breaking or feature change)

What is the current behavior?

(if this is a breaking or feature change)

What libraries were added/updated?

(list all with version changes)

Does this change affect performance?

(if so describe the impacts positive or negative)

Does this change affect security?

(if so describe the impacts positive or negative)

What alternative approaches were there?

(briefly list any if applicable)

What feature flags were used to cover this change?

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Does this PR introduce a breaking change?

(check only one)

• Yes, and covered entirely by feature flag(s)
• Yes, and covered partially by feature flag(s)
• No
• Not sure (briefly explain the situation below)

What level of testing was included in the change?

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• e2e
• integration
• unit

Which logical domain(s) does this change affect?

(for bug fixes/features, be as precise as possible. ex. Authentication, Annotation History, Review Stream etc.)

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (d431f8a) 75.86% compared to head (db88c38) 75.85%.
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4676      +/-   ##
===========================================
- Coverage    75.86%   75.85%   -0.01%     
===========================================
  Files          157      157              
  Lines        12515    12531      +16     
===========================================
+ Hits          9494     9505      +11     
- Misses        3021     3026       +5     

see 6 files with indirect coverage changes

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[jombooth]

/git merge develop

Successfully pushed new changes:
Merge remote-tracking branch 'origin/develop' into fb-LSDV-5289-1/serialize-rq-jobs-deadlocks (db88c38)

Workflow run

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AttributeError: 'Settings' object has no attribute 'RECALCULATE_ALL_STATS' projects.models in <module> View Issue

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