Revert "Enable strict typing in Homebrew::TestBot"

[botantony]

Reverts #21506

This PR breaks a lot of different workflows in homebrew-core:
https://github.com/Homebrew/homebrew-core/actions/runs/21745012156/job/62728656357
https://github.com/Homebrew/homebrew-core/actions/runs/21744079032/job/62725959075
https://github.com/Homebrew/homebrew-core/actions/runs/21744048095/job/62725855729

[chenrui333]

this is probably better.

[Copilot]

Pull request overview

This PR reverts a previous change (PR #21506) that enabled strict typing in Homebrew::TestBot. The strict typing changes broke multiple workflows in homebrew-core, necessitating this revert.

Changes:

• Reverts typing level from # typed: strict to # typed: true across all test_bot files
• Removes Sorbet type signatures (sig blocks) and type annotations (T.let, T.must, etc.)
• Adds .rbi stub files for some classes/modules to maintain type checking support
• Simplifies method calls by removing explicit .to_s conversions on Pathnames

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Library/Homebrew/test_bot/test_runner.rb	Reverted strict typing, removed type signatures, simplified module to use module_function instead of class methods
Library/Homebrew/test_bot/test_runner.rbi	Added stub file for TestRunner module
Library/Homebrew/test_bot/test_formulae.rb	Reverted strict typing, removed type signatures and annotations
Library/Homebrew/test_bot/test_formulae.rbi	Added stub file for TestFormulae class
Library/Homebrew/test_bot/test_cleanup.rb	Reverted strict typing, removed .to_s conversions for Pathname arguments
Library/Homebrew/test_bot/test.rb	Reverted strict typing, combined attr_reader declarations
Library/Homebrew/test_bot/tap_syntax.rb	Reverted strict typing, simplified method implementation
Library/Homebrew/test_bot/step.rb	Reverted strict typing, removed type annotations
Library/Homebrew/test_bot/setup.rb	Reverted strict typing
Library/Homebrew/test_bot/junit.rb	Reverted strict typing, removed T.must assertions
Library/Homebrew/test_bot/formulae_detect.rb	Reverted strict typing, simplified early return logic
Library/Homebrew/test_bot/formulae_dependents.rb	Reverted strict typing, simplified attr_writer declarations
Library/Homebrew/test_bot/formulae.rb	Reverted strict typing, removed complex initialization type annotations
Library/Homebrew/test_bot/cleanup_before.rb	Reverted strict typing
Library/Homebrew/test_bot/cleanup_after.rb	Reverted strict typing
Library/Homebrew/test_bot/bottles_fetch.rb	Reverted strict typing
Library/Homebrew/test_bot.rb	Reverted strict typing in main module
Library/Homebrew/test/test_bot/setup_spec.rb	Updated test to use correct class reference

Files not reviewed (2)

• Library/Homebrew/test_bot/test_formulae.rbi: Language not supported
• Library/Homebrew/test_bot/test_runner.rbi: Language not supported

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