Implement lastSyncRequestedDate tracking support

[jujaga]

Description

This PR focuses on ensuring that the lastSyncRequestedDate is logged whenever a successful syncBucket or syncDefault request occurs. Also fixes a few long standing skipped unit tests.

SHOWCASE-3507

Types of changes

New feature (non-breaking change which adds functionality) Documentation (non-breaking change with enhancements to documentation)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have checked that unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation (if appropriate)

Further comments

[github-actions[bot]]

Coverage Report

Totals
Statements:	60.27% ( 2863 / 4750 )
Methods:	50.78% ( 325 / 640 )
Lines:	67.12% ( 1713 / 2552 )
Branches:	52.95% ( 825 / 1558 )

[codeclimate[bot]]

Code Climate has analyzed commit 8e7070d8 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 67.1% (0.3% change).

View more on Code Climate.