fix: export and import UI bugs

[KristinAoki]

JIRA Ticket: TNL-11052

1. Change learn more button to link
2. Main body text should be small
3. Update alert modal component to include icon
4. Fix header bottom margin
5. Update icons to be CheckCircle when step completes for export/import
6. Update table to take up full space of section
7. Update success date and time to be localized
8. fix wrapping on sidebar
9. Move selected file message to top of import card
10. Fix missing word studio in export and import sidebar messages

Testing

Import

1. import a course to see the icons change from gears to CheckCircle
2. Check the success time is not utc and matchs expected time zone.
3. After import, the name of the imported file should appear above the dropzone area
4. Check that the learn more text in the side bar is a link

Export

1. export a course to see the icons change from gears to CheckCircle
2. Check the success time is not utc and matchs expected time zone.
3. Check that the learn more text in the side bar is a link

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2ea876a) 86.61% compared to head (185c2fd) 86.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #612      +/-   ##
==========================================
- Coverage   86.61%   86.60%   -0.01%     
==========================================
  Files         386      386              
  Lines        5731     5743      +12     
  Branches     1256     1267      +11     
==========================================
+ Hits         4964     4974      +10     
- Misses        743      745       +2     
  Partials       24       24              

Files	Coverage Δ
src/export-page/CourseExportPage.jsx	96.15% <ø> (ø)
src/export-page/export-footer/ExportFooter.jsx	100.00% <100.00%> (ø)
src/export-page/export-sidebar/ExportSidebar.jsx	100.00% <ø> (ø)
src/export-page/export-stepper/ExportStepper.jsx	96.42% <100.00%> (+0.42%)	⬆️
src/generic/course-stepper/index.jsx	100.00% <100.00%> (ø)
src/generic/modal-error/ModalError.jsx	100.00% <ø> (ø)
src/generic/sub-header/SubHeader.jsx	100.00% <100.00%> (ø)
src/import-page/CourseImportPage.jsx	95.23% <ø> (ø)
src/import-page/file-section/FileSection.jsx	92.85% <100.00%> (-0.48%)	⬇️
src/import-page/import-sidebar/ImportSidebar.jsx	100.00% <ø> (ø)
... and 2 more

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