fix(input): remove z-index target-area for ionic theme (#30261)

Issue number: internal
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## What is the current behavior?
Currently, operations associated with gestures aren’t working, for the
ionic theme:
- can’t select the text using double tap
- can’t longpress
- can’t move the cursor to any positions

## What is the new behavior?
- It's now possible to select text using double tap, long press and move
the cursor to different positions
- Adds new tests for double clicks

| Before | Now |
|--------|-----|

|![prev](https://github.com/user-attachments/assets/c1c54710-e534-44bf-9ef9-6ddc990996d9)
|
![now](https://github.com/user-attachments/assets/b10b8696-e0bb-4e99-9d3d-fe5a92d384e8)
|

## Does this introduce a breaking change?
- [ ] Yes
- [x] No

## Notes
Currently, the double click text selection is not working (the text
isn't selected) on the automated tests for:
- ionic theme, on firefox and safari
- md/ios themes, on firefox

as manual tests do not have this problem, we'll be skipping these tests
for now and come back to them at a later date

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Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>