use istio envoy release-1.8 instead of envoy-wasm

[joaovitor]

What this PR does / why we need it:

Updates the envoy version used in the istio proxy to use official envoy instead of envoy-wasm.
envoy-wasm has been merged to envoy envoyproxy/envoy#12546

Special notes for your reviewer:

I just updated with curl -sSL https://raw.githubusercontent.com/envoyproxy/envoy/master/.bazelrc > envoy.bazelrc

[istio-policy-bot]

😊 Welcome @joaovitor! This is either your first contribution to the Istio proxy repo, or it's been
awhile since you've been here.

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[istio-testing]

Hi @joaovitor. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[bianpengyuan]

Hi @joaovitor istio/proxy master currently references istio/envoy release-1.8 branch, because we are about to cut istio release-1.8 and it needs to map to envoy 1.16 (which is what istio/envoy release-1.8 is currently at). Could you update the bazel file to be the same as that repo please? thanks!

[bianpengyuan]

/ok-to-test

[joaovitor]

@bianpengyuan just updated it.