fix(api): avoid panic on invalid absolute endpoint URL

Mikelrequested to merge
mikelolasagasti/glab-cli:fix-crash into main

Description

Ignore url.Parse errors caused glab api to pass a nil *url.URL into NewHTTPRequest and panic in URL.String(). Absolute endpoints (containing ://) bypass the validated base URL and could be malformed user input.

Related Issues

Resolves #8264 (closed)

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