feat(runners): add reset by token and router discovery endpoints

Zubeenrequested to merge
gitlab-community/gitlab-org/api/client-go:feat/runners-reset-by-token-router-discovery into main

Adds two RunnersService methods:

  • ResetRunnerAuthenticationTokenByToken for POST /runners/reset_authentication_token
  • GetRunnerRouterDiscovery for GET /runners/router/discovery, which sends the runner token as the Runner-Token header

Related

Closes #2318 (closed)

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