Fix cut_release_branch.yml for cut 1.11.latest

[emmyoop]

Problem

Cutting new release branches fails because #12129 moved where the current version lives.

Solution

Look at the right file for version (pyproject.toml) and also move this workflow directly into this repo since adapters no longer uses it. No need for it to be centralized anymore.

Testing: https://github.com/dbt-labs/dbt-core/actions/runs/19470506924

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.93%. Comparing base (39cf2ec) to head (8666c83).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12178   +/-   ##
=======================================
  Coverage   91.93%   91.93%           
=======================================
  Files         203      203           
  Lines       24847    24847           
=======================================
  Hits        22844    22844           
  Misses       2003     2003           

Flag	Coverage Δ
integration	88.81% <ø> (ø)
unit	65.20% <ø> (ø)

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Components	Coverage Δ
Unit Tests	65.20% <ø> (ø)
Integration Tests	88.81% <ø> (ø)

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