fix: strip token whitespace to prevent invalid Authorization header

[sentry]

This PR addresses the ValueError: Invalid header value that occurs when the Codecov token contains trailing whitespace, such as a newline character. This typically happens when the token is read from an environment variable or file that includes such characters.

The fix involves adding .strip() to the token string before it is interpolated into the Authorization header in both get_token_header and get_token_header_or_fail functions within codecov_cli/helpers/request.py. This ensures that any leading or trailing whitespace is removed, guaranteeing a valid HTTP header format.

Fixes CLI-BS

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