Remove unnecessary color contrast calculation

[vargaat]

I noticed that there are significant lags and fps drops on screens using the ContextButton button style. This was because this style re-calculated the color to get it to the minimum contrast ratio but in fact colors reaching the UI should already have enough contrast ratio after the color palette update that we delivered recently.

affects: Student, Teacher, Parent

[ignore-commit-lint]

Screenshots

Before	After
RPReplay_Final1729154828.MP4	RPReplay_Final1729155047.MP4

Checklist

• Tested on phone
• Tested on tablet
• Tested in dark mode
• Tested in light mode

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Parent Build QR Code:

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Teacher Build QR Code:

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Student Build QR Code:

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	Warnings
⚠️	One or more files are below the minimum test coverage 50%

Coverage	New %	Master %	Delta
Canvas iOS	91.18%	91.18%	-0.01%
Core/Core/Planner/CalendarEvent/Model/API/PostCalendarEventRequest.swift	0%	0%	0%
Core/Core/Planner/CalendarEvent/View/CustomFrequencyComponents/OccurrencesCountInputDialog.swift	0%	0%	0%
Core/Core/Planner/CalendarEvent/Model/Helpers/RecurrenceRule+SelectionDescription.swift	43.33%	43.33%	0%
Core/Core/Grades/View/CustomSwipeAction.swift	0%	0%	0%

Generated by 🚫 dangerJS against 7a40ad5

[Ahmed-Naguib93]

QA +1

[rh12]

QA + 1

[ndrsszsz]

QA +1