Fix configuring TTS engine

[Pwuts]

Background

TEXT_TO_SPEECH_PROVIDER is bulldozed in ConfigBuilder.build_config_from_env():

• Refactor/remove abstract singleton as voice base parent #4931 (comment)
• https://github.com/Significant-Gravitas/Auto-GPT/blob/a758acef2cf12b206d7172b47880dd876f8ad4bc/autogpt/config/config.py#L289

Changes

• Enclose the offending piece of code in an if not config_dict["text_to_speech_provider"]
• Get config values from config_dict instead of repeatedly calling os.getenv for the same variable

Documentation

x

Test Plan

CI

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[codecov]

Codecov Report

Patch coverage: 22.22% and project coverage change: -0.03 ⚠️

Comparison is base (a758ace) 51.02% compared to head (4312543) 51.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5005      +/-   ##
==========================================
- Coverage   51.02%   51.00%   -0.03%     
==========================================
  Files         118      118              
  Lines        4898     4898              
  Branches      649      650       +1     
==========================================
- Hits         2499     2498       -1     
  Misses       2215     2215              
- Partials      184      185       +1     

Impacted Files	Coverage Δ
autogpt/config/config.py	80.00% <22.22%> (-0.61%)	⬇️

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