Reduce memory usage of Analyzer test suite

[hhobson]

Change Description

Reduce memory usage of Presidio Analyzer test suite (excluding Azure AI language recognizer tests) down to ~6GB from ~8GB. When run locally the tests runtime went from ~60 seconds to ~25 seconds.

Memray memory usgae graphs

Before

After

Changes

• Removed duplicate nlp.load call on each iteration of Stanza and transformers recognizer tests.
• Paramatized test_when_analyze_with_unsupported_language_must_match tests to avoid calling AnalyzerEngine five times in single test
• Mocked nlp engine in test_when_analyze_with_unsupported_language_must_match as test doesn't require nlp model to be loaded
• Removed unused fixtures - pytest-unused-fixtures plugin used to detect them

Issue reference

This PR fixes issue #1427

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA (if required)
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

[hhobson]

@microsoft-github-policy-service agree

[omri374]

Thanks!

[omri374]

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[omri374]

/azp run

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[omri374]

/azp run

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