RSpec: Use conditional hooks for money precision

[tagliala]

• Blocked by Improve CI permissions and fix Java for JRuby 10 #1141

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Move the Money.default_infinite_precision test setup from a shared context into global, conditional RSpec hooks.

The previous shared_context approach, which relied on implicit metadata inclusion, is deprecated and was failing with the modern shared_context_metadata_behavior = :apply_to_host_groups setting.

An explicit include_context is unsuitable because this behavior is sometimes required for individual examples (it blocks), where contexts cannot be included.

This commit defines global before and after hooks in the RSpec configuration that are filtered by the
:default_infinite_precision_true metadata tag. This provides a declarative and efficient way to apply the necessary setup and teardown to any example group or individual example without repetitive code, while aligning with modern RSpec practices.

Close #1136

[tagliala]

Failures:

  1) Money::Currency#initialize is thread safe
     Failure/Error: expect(ids.uniq.length).to eq(1)

       expected: 1
            got: 2

       (compared using ==)
     # ./spec/currency_spec.rb:249:in 'block in <main>'

rspec ./spec/currency_spec.rb:246 # Money::Currency#initialize is thread safe

🤔

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This looks to be a random failure. I can't replicate this locally

Finished in 9.41 seconds (files took 5.86 seconds to load)
515 examples, 0 failures

Randomized with seed 9926