Strip line numbers from write to file

[mrubens]

• More robust fix for Extra line numbers will be displayed when saving #149
• Fix for Diff appears on unwanted locations #146

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Important

Fixes line number handling in file content by adding functions to strip line numbers and updating relevant logic in Cline.ts and search-replace.ts.

• Behavior:
  • In Cline.ts, diffViewProvider.update() now strips line numbers if present using stripLineNumbers().
  • In search-replace.ts, applyDiff() strips line numbers from search and replace sections if all lines have them.
• Functions:
  • Add everyLineHasLineNumbers() and stripLineNumbers() to extract-text.ts.
• Tests:
  • Add tests for everyLineHasLineNumbers() and stripLineNumbers() in extract-text.test.ts.
  • Add tests for line number stripping in search-replace.test.ts.

^{This description was created by for 86bb389. It will automatically update as commits are pushed.}

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