Flakiness downloading bazel (on windows)

[phlax]

Our (Envoy) Windows CI seems to fail fairly frequently downloading the bazel bin:

2023/03/03 08:56:37 Downloading https://releases.bazel.build/6.0.0/release/bazel-6.0.0-windows-x86_64.exe...
2023/03/03 08:56:51 could not download Bazel: HTTP GET https://releases.bazel.build/6.0.0/release/bazel-6.0.0-windows-x86_64.exe failed: Get "[https://releases.bazel.build/6.0.0/release/bazel-6.0.0-windows-x86_64.exe"](https://releases.bazel.build/6.0.0/release/bazel-6.0.0-windows-x86_64.exe%22): net/http: TLS handshake timeout

https://dev.azure.com/cncf/envoy/_build/results?buildId=129800&view=logs&j=b840a642-5ff3-5357-2e4b-e06e40b0cffd&t=67965174-5100-5631-9dc0-68b9f0aacb53&l=56

i didnt notice this happening in other jobs - so i believe this is specific to windows - but im not certain of this

either way, im wondering if it would be possible to add some retry logic/config as i see discussed elsewhere

[alyssawilk]

https://dev.azure.com/cncf/envoy/_build/results?buildId=132015&view=results

https://dev.azure.com/cncf/envoy/_build/results?buildId=132024&view=results

[celestialorb]

Slapped together a rather rudimentary implementation in #495 as I've been encountering issues while downloading where a basic retry would likely have solved it.

[phlax]

cc @akshaysngupta

[akshaysngupta]

@celestialorb's PR looks reasonable to me. Can someone from maintainers review this?