Add regexes to detect common wild foods Livelihood Activities - see HEA-572

[rhunwicks]

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[Copilot]

Pull Request Overview

This PR adds regular expression patterns to detect and categorize wild foods livelihood activities. The changes enable the system to recognize various formats of wild food gathering entries in livelihood activity data.

• Updates regex patterns to handle wild food gathering activities with specific formatting variations
• Expands character set support in product patterns to include numbers (1-9)
• Adds comprehensive test cases for the new wild food detection patterns

Reviewed Changes

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

File	Description
pipelines/assets/livelihood_activity.py	Extends product pattern regex to include numbers 1-9 for better wild food product matching
pipelines/assets/livelihood_activity_regexes.json	Adds three new regex patterns to detect wild foods and fish gathering activities
pipelines_tests/test_assets/test_livelihood_activity_regexes.json	Adds test cases for avocado, mangoes, okra, tilapia, and fish type 2 gathering activities

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