Remove previous workarounds for when super() could not be pickled on Py3

[ByteFlowing1337]

Related to #7710 and BEAM-6158.

Since uqfoundation/dill#300 was resolved a long time ago, we should revert these workarounds now.

[gemini-code-assist]

Summary of Changes

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This pull request cleans up technical debt by removing outdated workarounds previously required for pickling super() calls in Python 3. By reverting to standard super().__init__() calls, the codebase is now more idiomatic and aligned with modern Python practices, following the resolution of the underlying issue in the dill library.

Highlights

• Code Cleanup: Removed legacy workarounds that manually called base class constructors in __init__ methods across multiple Apache Beam examples.
• Modernization: Updated class initializers to use the standard super().__init__() pattern, now that dill supports pickling super() objects in Python 3.

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[gemini-code-assist]

Code Review

This pull request cleans up workaround code related to BEAM-6158 across several Python examples. It replaces explicit base class initialization calls (such as beam.PTransform.init(self) and beam.DoFn.init(self)) with standard super().init() calls, and removes the obsolete TODO comments. There are no review comments, and I have no additional feedback to provide.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.39%. Comparing base (30a5a00) to head (bb84e40).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #39187      +/-   ##
============================================
+ Coverage     55.33%   55.39%   +0.06%     
  Complexity     2198     2198              
============================================
  Files          1107     1107              
  Lines        172166   172335     +169     
  Branches       1417     1417              
============================================
+ Hits          95267    95465     +198     
+ Misses        74462    74433      -29     
  Partials       2437     2437              

Flag	Coverage Δ
python	79.40% <ø> (+0.08%)	⬆️

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[github-actions]

Assigning reviewers:

R: @shunping for label python.

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[ByteFlowing1337]

@shunping Do you mind reviewing this PR?
These workarounds are quite obvious; they are represented publicly in the playground examples of the Python SDK on beam.apache.org.