fix: strip whitespace from CODECOV_TOKEN in Authorization header

[sentry]

The CODECOV_TOKEN environment variable, especially when sourced from CI environments like GitHub Actions, can contain trailing newline characters (e.g., \n\n). When this token is used to construct the Authorization header in HTTP requests, the requests library correctly rejects the header value due to these invalid characters, raising an InvalidHeader exception.

This fix addresses the issue by calling .strip() on the token value 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, including newlines, is removed before the token is interpolated into the Authorization header, preventing the InvalidHeader error.

Fixes CLI-1R

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[sentry]

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