fix: GetTrialRemainingLogRetentionDays should take global log retention days into account [CM-518]

[salonig23]

Ticket

CM-518

Description

GetTrialRemainingLogRetentionDays was not taking global log retention days into account while calculating remaining days. Fixed it by adding a check and an automated test for this scenario.

Test Plan

Added automated test.
For manual testing:

1. Add a global log retention policy to master config:

 retention_policy:
         log_retention_days: 90
         schedule: 0 3 * * *

3. Start devcluster.
4. Create an experiment and do not specify the log retention days.
5. After a trial under the experiment is completed, the remaining log retention days on the Logs tabs of the trial overview shows accurate value (89 days)

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.24%. Comparing base (8fb9f6b) to head (d156c93).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9914   +/-   ##
=======================================
  Coverage   59.24%   59.24%           
=======================================
  Files         750      750           
  Lines      104341   104341           
  Branches     3597     3597           
=======================================
  Hits        61812    61812           
  Misses      42398    42398           
  Partials      131      131           

Flag	Coverage Δ
backend	43.80% <ø> (ø)
harness	72.75% <ø> (ø)
web	54.40% <ø> (ø)

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[corban-beaird]

LGTM!