[carbon-web-components]: update unit tests and snapshots

[kennylam]

Blocked by #11192

Due to the update of @carbon/web-components to v11, the resulting markup/DOM changes have broken various unit tests. These tests will need to be updated to reflect the structural changes in the components themselves. Items in the tasklist should be converted to issues as they are assigned.

Note

Tests/assertions should match those used in @carbon/react components.

Components.

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1. accordion
2. breadcrumb
3. button
4. checkbox
5. code snippet
6. combo box
7. content switcher
8. copy button
9. datatable
10. date picker
11. dropdown
12. file uploader
13. form group
14. icon button
15. icon
16. inline loading
17. layer
18. link
19. ordered list
20. unordered list
21. loading
22. modal
23. multi select
24. notifications
25. number input
26. overflow menu
27. pagination
28. popover
29. progress bar
30. progress indicator
31. radio button
32. search select
33. skeleton
34. skip to content
35. slider
36. slug
37. structured list
38. tabs
39. tag
40. text input
41. text area
42. tile
43. toggletip
44. toggle
45. tooltip
46. ui shell