Backport of [OSS] Fix initial_fetch_timeout to wait for all xDS resources into release/1.16.x #18065
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Backport
This PR is auto-generated from #18024 to be assessed for backporting due to the inclusion of the label backport/1.16.
The below text is copied from the body of the original PR.
Description
Attempt 2 at closing #17283
Because we use the default initial_fetch_timeout in the Envoy bootstrap, not all Envoy resources may be loaded in busy systems. However, we previously relied on the timeout to start ingress and API gateways. This PR:
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