Remove upgrade controller from OPCM

[alcueca]

Fixes this task by removing upgradeController from OPCM, now that it is not used anymore.

Outside OPCM, upgradeController becomes l1PAO, which is the same thing, but in a more recognizable name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.99%. Comparing base (3ee883b) to head (182a644).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #17660      +/-   ##
===========================================
+ Coverage    74.83%   80.99%   +6.15%     
===========================================
  Files          173      118      -55     
  Lines        11064     6278    -4786     
===========================================
- Hits          8280     5085    -3195     
+ Misses        2638     1193    -1445     
+ Partials       146        0     -146     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	80.99% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
...es/contracts-bedrock/src/L1/OPContractsManager.sol	96.32% <100.00%> (-0.01%)	⬇️

... and 55 files with indirect coverage changes

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[maurelian]

Very happy about this change!