[ENHANCEMENT] Auto input resize for text variables

[AntoineThebaud]

Description

Implement dynamic input resize for Text variables, as it was done for List variables in #1576.

As in this past PR, the computed input size doesn't perfectly fit the text content due to the approximation done to consider that each character = 8px. It's still better than before but could for sure be improved.

Screenshots

2023-12-18_11h29_01.mp4

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

UI Changes

• Changes that impact the UI include screenshots and/or screencasts of the relevant changes.
• Code follows the UI guidelines.
• Visual tests are stable and unlikely to be flaky.
  See Storybook
  and e2e docs for more details. Common issues
  include:
  • Is the data inconsistent? You need to mock API requests.
  • Does the time change? You need to use consistent time values or mock time utilities.
  • Does it have loading states? You need to wait for loading to complete.