[Rewriter]: introduce remove_optional_bias

[AyoubMDL]

Fixes #2547. I've kept the same ops as in #2555.

[codecov]

Codecov Report

❌ Patch coverage is 97.01493% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.46%. Comparing base (80f28c9) to head (920a5d3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ipt/rewriter/rules/common/_remove_optional_bias.py	95.12%	1 Missing and 1 partial ⚠️
...ewriter/rules/common/_remove_optional_bias_test.py	97.82%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2635      +/-   ##
==========================================
+ Coverage   70.32%   70.46%   +0.13%     
==========================================
  Files         222      224       +2     
  Lines       26438    26572     +134     
  Branches     2632     2637       +5     
==========================================
+ Hits        18593    18723     +130     
- Misses       6926     6928       +2     
- Partials      919      921       +2     

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