Aditya Manthramurthy 4a0a491ca1 Refactor update check code (#5020)
- Add release-time conversion helpers
- Split GetCurrentReleaseTime() into two simpler functions.
- Avoid appending strings when assembling user-agent string.
- Reorder release info URLs to check the newer URLs earlier.
- Remove trivial low-level functions created solely for the purpose of
  writing tests.
- Remove some unnecessary tests.
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