fix: Improve HTML validity of Internal Inputs in TextFilter

[jorycunningham]

Description

This PR changes the outer element of the Internal Input to a span, rather than a div to ensure that when nested in a span (as in the Text Filter Component) that the HTML remains valid.

Note: the element already had display:flex applied so no changes needed to preserve box layout

Addresses AWSUI-20178

How has this been tested?

Tested manually with local build, visual regression

Review checklist

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

Correctness

• Changes include appropriate documentation updates.
• 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?

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[codecov]

Codecov Report

Base: 92.60% // Head: 92.97% // Increases project coverage by +0.36% 🎉

Coverage data is based on head (2632be4) compared to base (2ac7599).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
+ Coverage   92.60%   92.97%   +0.36%     
==========================================
  Files         559      574      +15     
  Lines       15811    16766     +955     
  Branches     4327     4628     +301     
==========================================
+ Hits        14642    15588     +946     
- Misses       1087     1101      +14     
+ Partials       82       77       -5     

Impacted Files	Coverage Δ
src/input/internal.tsx	100.00% <100.00%> (ø)
src/breadcrumb-group/item/item.tsx	42.85% <0.00%> (-57.15%)	⬇️
src/table/resizer/index.tsx	83.51% <0.00%> (-16.49%)	⬇️
src/flashbar/index.tsx	53.94% <0.00%> (-10.06%)	⬇️
src/split-panel/icons/bottom-icon-refresh.tsx	33.33% <0.00%> (-9.53%)	⬇️
src/split-panel/icons/side-position-refresh.tsx	36.36% <0.00%> (-8.09%)	⬇️
src/internal/hooks/use-focus-tracker.ts	92.30% <0.00%> (-7.70%)	⬇️
src/hotspot/index.tsx	95.00% <0.00%> (-5.00%)	⬇️
src/wizard/wizard-actions.tsx	92.00% <0.00%> (-4.00%)	⬇️
src/autosuggest/utils/utils.ts	96.00% <0.00%> (-4.00%)	⬇️
... and 212 more

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[avinashbot]

Thank you!