Ruby: Add SyntheticGlobal test

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[Copilot]

Pull Request Overview

This PR adds a new test for SyntheticGlobal functionality in Ruby dataflow summaries.

• Adds a new test class in summaries.rb to exercise tainted flows from database operations.
• Updates Summaries.ext.yml to map the newly introduced methods to SyntheticGlobal.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
ruby/ql/test/library-tests/dataflow/summaries/summaries.rb	Introduces SynthGlobalTest with store and read methods for testing tainted flow handling.
ruby/ql/test/library-tests/dataflow/summaries/Summaries.ext.yml	Adds method mappings for saveToDatabase and readFromDatabase using SyntheticGlobal.

Comments suppressed due to low confidence (1)

ruby/ql/test/library-tests/dataflow/summaries/summaries.rb:170

• The class name 'SynthGlobalTest' is inconsistent with the 'SyntheticGlobal' reference used in the YAML file. Rename it to 'SyntheticGlobalTest'.

class SynthGlobalTest

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