chore: Remove getBlurRelatedEventTarget utility

[avinashbot]

Description

Pretty light easy fix. This one's a hack needed for React ~16.8 on IE11. The focus implementation was changed in React 17 (facebook/react#3751) anyway. Not a major issue, so this can wait, but it's a nice tiny code delete, and I always love that.

How has this been tested?

Testing it right here in GitHub actions mostly. I gave the components a quick manual once-over, but our existing tests are the only reliable way here.

Documentation changes

[Do the changes include any API documentation changes?]

• Yes, this change contains documentation changes.
• No.

Related Links

[Attach any related links/pull request for this change]

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Base: 92.58% // Head: 92.59% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (3b3e4c8) compared to base (385bce1).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #379   +/-   ##
=======================================
  Coverage   92.58%   92.59%           
=======================================
  Files         558      558           
  Lines       15893    15886    -7     
  Branches     4360     4357    -3     
=======================================
- Hits        14714    14709    -5     
+ Misses       1098     1096    -2     
  Partials       81       81           

Impacted Files	Coverage Δ
src/date-range-picker/calendar/index.tsx	79.68% <ø> (ø)
src/internal/components/dropdown-status/index.tsx	97.22% <0.00%> (+5.11%)	⬆️
src/internal/events/index.ts	100.00% <ø> (ø)
src/date-range-picker/calendar/grids/grid.tsx	100.00% <100.00%> (ø)
src/input/internal.tsx	100.00% <100.00%> (ø)
...rc/internal/components/autosuggest-input/index.tsx	95.48% <100.00%> (-0.04%)	⬇️
src/internal/components/button-trigger/index.tsx	100.00% <100.00%> (ø)
src/internal/components/options-list/index.tsx	97.72% <100.00%> (ø)

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