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CI: Coverage pages 404

Description:

What issue is being seen? Describe what should be happening instead of
the bug, for example: Envoy should not crash, the expected value isn't
returned, etc.

404 when going to GCS bucket for coverage report using the link given by CI.

Repro steps:

Go to recent coverage CI output to see the uploaded coverage report. For example: #23935, we'd get linked to https://storage.googleapis.com/envoy-pr/87dbffb/coverage/index.html which encounters the error below:

<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Details>No such object: envoy-pr/87dbffb/coverage/index.html</Details>
</Error>