fix: fix HPE_INVALID_HEADER_TOKEN error on creating new GitHub project

[Chhavi-Mandowara]

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[Copilot]

Pull Request Overview

This PR addresses the HPE_INVALID_HEADER_TOKEN error when creating a new GitHub project by refactoring how API headers are defined.

• Consolidates API header construction in a single variable to reduce code duplication
• Applies conditional header inclusion based on configuration values

Comments suppressed due to low confidence (1)

src/base-command.ts:212

• [nitpick] Consider renaming 'organization_uid' to use a consistent header naming convention (e.g., 'x-organization-uid'), in line with 'x-project-uid'.

headers['organization_uid'] = organizationUid;

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