DOC: Replace @Appender with inlined docstrings for IntervalArray #62437

[ahmedbektic]

• closes DOC: Replace @Appender, @Substitution, @doc with inlined docstrings #62437
• [Tests added and passed] if fixing a bug or adding a new feature
• All [code checks passed].
• Added [type annotations] to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

This pull request addresses part of #62437

• Replaced @appender decorators with hardcoded docstrings in the following IntervalArray methods:
  • IntervalArray class docstring
  • from_breaks
  • from_arrays
  • from_tuples
  • overlaps
  • repeat
• Removed shared docstring templates and infrastructure
• Removed now-unused textwrap import

[ahmedbektic]

pre-commit.ci autofix

[ahmedbektic]

Converted this PR to draft until tests are fixed