Removed deprecated Envoy runtime guard

[gopkarthik]

Runtime guard was removed in envoyproxy/envoy#30446.

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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[gopkarthik]

/test all

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@gopkarthik: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ESPv2-presubmit-tsan	154ed1d	link	true	/test ESPv2-presubmit-tsan
ESPv2-cloud-run-e2e-cloud-function-http-bookstore	154ed1d	link	true	/test ESPv2-cloud-run-e2e-cloud-function-http-bookstore
ESPv2-presubmit-asan	154ed1d	link	true	/test ESPv2-presubmit-asan
ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore	154ed1d	link	true	/test ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore

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This pull-request has been approved by: gopkarthik, shuoyang2016

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[skjolber]

Unintentionally duplicated in #970

Not sure how removing config for a dead feature could break the tests, maybe it is time to try again @guoyilin42 / @shuoyang2016 ?