Automatic merge from submit-queue (batch tested with PRs 38741, 41301, 43645, 43779, 42337)

If we already have the right version of gazel installed, use it

**What this PR does / why we need it**: makes the bazel scripts marginally faster by only downloading/building gazel when necessary. Also removes the `followRedirects` config setting for gopkg.in which is no longer needed.

**Release note**:

```release-note
NONE
```