Individual extension modal

[diana-villalvazo-wgu]

Description

Add functionality to Add individual extension button, that opens a modal to fill a form and add individual due date extension.

Supporting information

Closes #31
Do not review/merge until PRs 62 and 63 are merged

Testing information

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Deprecated propTypes, defaultProps, and injectIntl patterns are not used in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Imports avoid using ../. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

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[codecov]

Codecov Report

❌ Patch coverage is 46.01770% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.61%. Comparing base (5b0d465) to head (f99de34).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dateExtensions/data/apiHook.ts	0.00%	18 Missing ⚠️
src/dateExtensions/data/api.ts	0.00%	13 Missing ⚠️
src/dateExtensions/DateExtensionsPage.tsx	72.72%	9 Missing ⚠️
...teExtensions/components/SelectGradedSubsection.tsx	11.11%	8 Missing ⚠️
...rc/dateExtensions/components/AddExtensionModal.tsx	50.00%	6 Missing ⚠️
src/dateExtensions/data/queryKeys.ts	0.00%	5 Missing ⚠️
...onents/SpecifyLearnerField/SpecifyLearnerField.tsx	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #69       +/-   ##
==========================================
+ Coverage   0.00%   65.61%   +65.61%     
==========================================
  Files          5       36       +31     
  Lines          7      349      +342     
  Branches       0       61       +61     
==========================================
+ Hits           0      229      +229     
- Misses         7      120      +113     

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