Downcase emails on write to DDB prod

[lukaszgryglicki]

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

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Assisted by Claude

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Pull request overview

This PR standardizes email casing/formatting by lowercasing (and trimming in several call sites) before persisting or querying user_emails in DynamoDB, and adds/updates utility scripts to help investigate logs and normalize existing stored emails.

Changes:

• Normalize emails (lowercase/trim/dedupe) before writing user_emails in the Go backend, and normalize lookup inputs for email-based queries.
• Apply email normalization in additional write paths (legacy handlers, approval list, signature approval removal).
• Improve log lookup helper robustness and add a utility script to downcase existing emails in DynamoDB.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
utils/search_aws_log_group.sh	Captures AWS CLI output to a temp file to correctly distinguish aws failures from jq failures.
utils/lookup_all_logs.sh	Enables set -euo pipefail so helper failures abort instead of being masked.
utils/downcase_emails.sh	New script to scan cla-*-users and update user_emails with normalized values (optionally applied).
cla-backend-legacy/internal/api/handlers.go	Lowercases/trims email values before writing user_emails in legacy v2 handlers.
cla-backend-go/users/repository.go	Adds centralized email normalization on create/update, and normalizes email input for lookup.
cla-backend-go/signatures/repository.go	Normalizes emails before using them in approval-list removal flows.
cla-backend-go/approval_list/repository.go	Normalizes requester email before storing user_emails on approval requests.
.gitignore	Ignores *user_emails.json artifacts generated by the new normalization script.

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