fix(data-table): maintain row size hierarchy when content wraps

[jesnajoseijk]

Closes #20759

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Fixes a DataTable issue where wrapped cell content could make size="md" rows taller than size="lg".

Changelog

New

• None

Changed

• Added explicit lg vertical padding for DataTable header labels and body cells
• 

Removed

• None

Testing / Reviewing

• Verified wrapped content no longer makes md rows taller than lg
• Ran yarn lint:styles

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• [ ] Updated documentation and storybook examples
• [ ] Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• [ ] Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.59%. Comparing base (c8d2416) to head (b7b1c21).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22629      +/-   ##
==========================================
- Coverage   89.60%   89.59%   -0.01%     
==========================================
  Files         582      582              
  Lines       53279    53279              
  Branches     7260     7312      +52     
==========================================
- Hits        47739    47737       -2     
- Misses       5403     5405       +2     
  Partials      137      137              

Flag	Coverage Δ
main-packages	87.61% <ø> (ø)
web-components	90.25% <ø> (-0.01%)	⬇️

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[adamalston]

I think some of the checklist items in the description should be updated based on the guidance provided in the template.

carbon/.github/PULL_REQUEST_TEMPLATE.md

Line 28 in 845756c

If some do not apply, ~strike through the item text with tildes~.

[Kritvi-bhatia17]

Hi @jesnajoseijk! Thanks for working on this, can you please also fix the same for web components?

[tay1orjones]

Looking through the UI Tests: @carbon/react storybook snapshots that have changed on Chromatic, I would expect there to be no change to any of the stories because none of them have wrapping text and this PR doesn't change any of the stories. It would make sense to update one of the stories to have longer text to showcase this bug being fixed.

So two things:

1. The fix should not impact the visuals/snaps of existing stories at all
2. A story should be updated to contain wrapping text showcasing the fix, which should cause only those chromatic snaps to change

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