CDP-5966: make getCustomersByEmail query-safe (drop cleanEmail, use encodeURIComponent)

[sydneycollins-cio]

What

Fixes getCustomersByEmail to correctly encode the full email value in the query string. The previous cleanEmail helper only encoded each side of @ separately, leaving reserved characters like &, #, and ? unencoded — corrupting the query string.

Changes

lib/utils.ts — remove cleanEmail helper (no other callers).

lib/api.ts — replace cleanEmail(email) with encodeURIComponent(email) in getCustomersByEmail. Remove cleanEmail import.

test/util.ts — remove cleanEmail tests (helper no longer exists).

test/api.ts — update existing default test to expect encodeURIComponent output. Add two new tests covering emails with reserved characters (&, +, #, ?).

Closes CDP-5966.

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Note

Low Risk
Low risk: small change to URL encoding for a single API call plus accompanying test updates; behavior only differs for emails containing reserved URL characters.

Overview
Fixes APIClient.getCustomersByEmail to build a query-safe request by encoding the entire email with encodeURIComponent instead of the removed cleanEmail helper.

Removes cleanEmail from lib/utils.ts, deletes its unit test, and updates/adds test/api.ts coverage to assert correct encoding for reserved characters like &, #, and ?.

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