Fixes retry_in behaviour. Adds tests.

[rtibbles]

Summary

• Allows args and kwargs to be updated on already created jobs
• Properly updates repeat and interval values when using the retry_in Job method and retry_job_in Storage method
• Adds the tests for this behaviour that I should have added in the first place
• Does some small refactor within the Storage _update_job method, in order to prevent complexity linting errors

References

Fixes an issue that became very apparent during a bug bash

Fixes #11046

Reviewer guidance

Ensure that single user syncing is properly repeating

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0b0.dev0_git.2.gd3ff1286.pex
Windows Installer (EXE)	kolibri-0.16.0b0.dev0+git.2.gd3ff1286-unsigned.exe
Debian Package	kolibri_0.16.0b0.dev0+git.2.gd3ff1286-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b0.dev0+git.2.gd3ff1286-0.3.0.dmg
TAR file	kolibri-0.16.0b0.dev0+git.2.gd3ff1286.tar.gz
WHL file	kolibri-0.16.0b0.dev0+git.2.gd3ff1286-py2.py3-none-any.whl

[marcellamaki]

Approving after walk-through review with @rtibbles. @radinamatic - we will tag the beta tomorrow for the session and this will be ready to test on the APK to see if the syncing is working as expected there.