Avoid unnecessary HTTP requests for latest/last_rc #641
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The refactoring in #631 introduced a severe performance regression: With latest and last_rc the code traversed all GCS buckets for every existing Bazel version. Since we send one HTTP request per bucket, this behavior led to a significant increase in HTTP requests ( >140 instead of 2-3 requests).
This commit restores the previous, correct behavior: Traversal will be stopped as soon as a matching version has been found.
Moreover, this commit adds a test to prevent similar regressions in the future.
Fixes #640
Drive-by fix: Replaced "%s" with %q.