[Discover] use roundUp when converting timestamp for PPL

[joshuali925]

Description

When selecting Today, the time range would be now/d to now/d, which currently resolves to the same timestamp. This PR fixes it so that toDate is resolved while rounding up.

Issues Resolved

Screenshot

Testing the changes

Changelog

• fix: use roundUp when converting timestamp for PPL

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.88%. Comparing base (073a9ff) to head (53b6d79).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8935   +/-   ##
=======================================
  Coverage   60.87%   60.88%           
=======================================
  Files        3802     3802           
  Lines       91072    91072           
  Branches    14375    14375           
=======================================
+ Hits        55444    55446    +2     
+ Misses      32086    32085    -1     
+ Partials     3542     3541    -1     

Flag	Coverage Δ
Linux_1	29.02% <0.00%> (ø)
Linux_2	56.39% <0.00%> (ø)
Linux_3	37.91% <100.00%> (+0.01%)	⬆️
Linux_4	29.00% <0.00%> (ø)
Windows_1	29.03% <0.00%> (ø)
Windows_2	56.34% <0.00%> (ø)
Windows_3	37.91% <100.00%> (+<0.01%)	⬆️
Windows_4	29.00% <0.00%> (ø)

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