Resolve "Read Routable Private Access Token from PRIVATE-TOKEN header"

Lin Jen-Shinrequested to merge
75-header-private-token-pat into main

In the end we merge all the needed fixtures into src/rules/session_token.json for https://gitlab.com/gitlab-org/cells/http-router/-/issues/76

Closes #75

Edited by Lin Jen-Shin

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