Backport of Add stricter validation and some normalization code for API Gateway ConfigEntries into release/1.15.x #16312
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Backport
This PR is auto-generated from #16304 to be assessed for backporting due to the inclusion of the label backport/1.15.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
Description
I added stricter validation on writes for our config entries and also added some better normalization code. While most of these errors are already handled by setting invalid statuses on the config entries at reconciliation, this surfaces configuration errors quicker and also makes our reliant xDS code a bit more robust (for example, we weren't re-checking the DNS hostnames in certificates for later SNI generation, which could make envoy blow up).
This is stacked on #16300.
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