By @noxdafox: Improve rabbit_backing_queue:is_duplicate behaviour (#12913), take 2 (backport #12921)

[mergify]

This is #12913 by @noxdafox, take 2, re-submitted so that Actions have access to all the secrets.

---

This is an automatic backport of pull request #12921 done by Mergify.

[mergify]

Cherry-pick of 8d7535e has failed:

On branch mergify/bp/v4.0.x/pr-12921
Your branch is ahead of 'origin/v4.0.x' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 8d7535e0b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
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	new file:   deps/rabbit/src/rabbit_amqp_reader.hrl
	new file:   deps/rabbit/src/rabbit_msg_size_metrics.erl
	new file:   deps/rabbit/test/amqp_filtex_SUITE.erl
	new file:   deps/rabbit/test/amqp_utils.erl
	new file:   deps/rabbit/test/msg_size_metrics_SUITE.erl
	new file:   deps/rabbit/test/unit_msg_size_metrics_SUITE.erl
	new file:   deps/rabbitmq_auth_backend_oauth2/include/oauth2.hrl
	new file:   deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_keycloak.erl
	new file:   deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_provider.erl
	new file:   deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_rar.erl
	new file:   deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_resource_server.erl
	new file:   deps/rabbitmq_auth_backend_oauth2/test/rabbit_oauth2_provider_SUITE.erl
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	new file:   deps/rabbitmq_management/src/rabbit_mgmt_wm_connection_sessions.erl
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	new file:   deps/rabbitmq_management/test/rabbit_mgmt_schema_SUITE.erl
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	new file:   selenium/suites/authnz-messaging/auth-internal-mtls-backend.sh
	new file:   selenium/suites/mgt/amqp10-connections.sh
	new file:   selenium/test/authnz-msg-protocols/env.auth-mtls
	new file:   selenium/test/authnz-msg-protocols/env.tls
	new file:   selenium/test/authnz-msg-protocols/rabbitmq.auth-mtls.conf
	new file:   selenium/test/authnz-msg-protocols/rabbitmq.tls.conf
	new file:   selenium/test/oauth/keycloak/openssl.cnf.in
	new file:   selenium/test/oauth/uaa/server.xml
	new file:   selenium/test/pageobjects/ConnectionPage.js
	new file:   selenium/test/pageobjects/ConnectionsPage.js

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To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[michaelklishin]

Will submit a backport PR manually.