Fix label fonts in timeline events

[thomtrp]

As title

[greptile-apps]

PR Summary

This pull request focuses on fixing label fonts in timeline events by adjusting color properties for better consistency.

• Updated /packages/twenty-front/src/modules/activities/timelineActivities/rows/main-object/components/EventFieldDiffLabel.tsx to apply color styling to the entire container.
• Modified /packages/twenty-front/src/modules/activities/timelineActivities/rows/main-object/components/EventFieldDiffValue.tsx to set text color to the primary font color defined in the theme.

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