Unicron 4759 fix missing installation id prod

[lukaszgryglicki]

Fixes #4759 cc @mlehotskylf @jarias-lfx @ahmedomosanya

Signed-off-by: Lukasz Gryglicki lgryglicki@cncf.io

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Pull Request Overview

This PR fixes missing installation ID issues in production by enhancing the GitHub installation event handling logic and improving co-author detection for CLA checks. The changes include better user lookup mechanisms, improved error handling, and additional tracking for missing co-authors.

• Added installation ID validation and better error handling for GitHub webhook events
• Enhanced co-author detection with additional database lookups and missing co-author tracking
• Improved user search performance with new LF email index and optimized query methods

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
utils/search_aws_log_group.sh	Added validation for timestamp parameters to prevent invalid date parsing
utils/count_apis.sh	Enhanced API counting with additional regex patterns for LF IDs and null values
cla-backend/cla/utils.py	Added missing co-author message template and updated comment generation to track missing co-authors
cla-backend/cla/models/model_interfaces.py	Added new interface methods for faster user lookups by email
cla-backend/cla/models/github_models.py	Enhanced co-author detection with database fallback lookups and missing co-author tracking
cla-backend/cla/models/dynamo_models.py	Added LF email index for faster user queries and improved null value handling
cla-backend/cla/controllers/user.py	Updated to use faster email lookup method
cla-backend/cla/controllers/github.py	Improved GitHub installation event handling with better error handling and installation ID validation
cla-backend-go/v2/signatures/mock_users/mock_service.go	Added mock methods for new user lookup services
cla-backend-go/v2/sign/helpers.go	Updated to handle missing co-author tracking in pull request processing
cla-backend-go/users/service.go	Added new service methods for user lookups by email and LF email
cla-backend-go/users/repository.go	Implemented new repository methods for LF email queries with proper case handling
cla-backend-go/users/mocks/mock_repo.go	Added mock method for LF email user lookup
cla-backend-go/signatures/service.go	Updated signature service to handle missing co-author tracking
cla-backend-go/github/github_repository.go	Enhanced co-author processing with database fallback and missing co-author message support
CO_AUTHORS.md	Updated documentation to reflect new database lookup fallback for co-authors

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