Revert account factory proxy deploy back to direct deploy

[nkrishang]

Given these benchmarks, we are reverting the account factories back from proxy deploys to direct deploys.

Presumably, app developers front costs of deploying a factory and onboarding users. All the savings from a proxy deployed factory are quickly offset upon onboarding a small amount of users, after which createAccount calls will permanently be more expensive compared to if the factory were direct deployed -- this is a bad trade-off.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (85874e3) 63.07% compared to head (7d2f2c1) 62.94%.

Files	Patch %	Lines
...cts/prebuilts/account/utils/BaseAccountFactory.sol	80.00%	2 Missing ⚠️
...racts/prebuilts/account/managed/ManagedAccount.sol	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #578      +/-   ##
==========================================
- Coverage   63.07%   62.94%   -0.14%     
==========================================
  Files         216      215       -1     
  Lines        6657     6639      -18     
==========================================
- Hits         4199     4179      -20     
- Misses       2458     2460       +2     

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