ci: Properly construct URLs.

Implement a new function "api-url", which constructs URLs using relative URI
and "resolve-uri-reference" (which implements the algorithm specified in RFC
3986 section 5.2.2) for building the URL, instead of just appending
strings. This avoids issued if the server-url ends with a slash.

Since "api-url" uses URI-objects, it makes sense to also construct the
query-part of the URL here. For this "api-url" accepts optional
key-value-pairs.

New function "json-api-fetch" is a wrapper using "api-url".

* guix/ci.scm (api-url): New function. (build): Use it.
  (json-api-fetch): New function. (queued-builds, latest-builds,
  evaluation, latest-evaluations, evaluation-jobs: Use it.

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