fix: increase subsection grades rounding precision

[Agrendalath]

We used two decimal digits to match the experience from the edx-platform. However, https://github.com/openedx/edx-platform/pull/27788 increased the precision to reduce the impact of double rounding.

See the details and testing instructions at https://github.com/openedx/edx-platform/pull/27788.

Private-ref: BB-4210

[openedx-webhooks]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.78%. Comparing base (b9d1198) to head (0ac36ee). Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1397   +/-   ##
=======================================
  Coverage   87.78%   87.78%           
=======================================
  Files         310      310           
  Lines        5320     5320           
  Branches     1350     1316   -34     
=======================================
  Hits         4670     4670           
  Misses        633      633           
  Partials       17       17           

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[itsjeyd]

@Agrendalath Thank you for this contribution!

It looks like the older PR that you mentioned in the description (https://github.com/openedx/edx-platform/pull/27788) is tagged for product review. Should we do the same here?

CC @mphilbrick211

[Agrendalath]

@itsjeyd, this is a part of the same product ticket.

[itsjeyd]

@Agrendalath OK great, I'll add the product review label now.

[itsjeyd]

@Agrendalath It looks like you got the go-ahead from product!

I updated labels and Contribution board status of this PR and https://github.com/openedx/edx-platform/pull/27788 to reflect that.

Please ping @committers-frontend-app-learning for review when you're done working on the changes and the build is green :)

CC @mphilbrick211

[Agrendalath]

@openedx/committers-frontend-app-learning, could you please review and merge this?