rptest: add "assert-ref-snapshot-id" to log allow list

[andrwng]

Now that we are logging the body of failed requests to the Iceberg REST catalog, we may end up with bad log line test failures that complain about messages with the following substring:

..."requirements":[{"type":"assert-ref-snapshot-id","ref":"main","snapshot-id":3902887918253494995}]...

This commit adds such messages to the allowed list.

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v25.2.x
• v25.1.x
• v24.3.x

Release Notes

• None

[Copilot]

Pull Request Overview

This PR adds a new regex pattern to the log allow list to prevent test failures when Iceberg REST catalog error messages containing "assert-ref-snapshot-id" appear in logs. The change allows tests to continue running without false positives from these benign error messages that occur during Iceberg catalog operations.

Key Changes:

• Adds regex pattern for "assert-ref-snapshot-id" to the log allow list in the Redpanda test service

[joe-redpanda]

Looks like CI failed on

test_id:    rptest.tests.workload_upgrade_runner_test.RedpandaUpgradeTest.test_workloads_through_releases.cloud_storage_type=CloudStorageType.S3

Which afaik is flakey, can we override merge this?

[vbotbuildovich]

CI test results

test results on build#73074

test_class	test_method	test_arguments	test_kind	job_url	test_status	passed	reason	test_history
ShadowLinkingReplicationTests	test_replication_basic	{"shuffle_leadership": true, "source_cluster_spec": {"cluster_type": "kafka", "kafka_quorum": "COMBINED_KRAFT", "kafka_version": "3.8.0"}}	integration	https://buildkite.com/redpanda/redpanda/builds/73074#019986f3-da6b-4ef7-bcd9-4b15ba0cf499	FLAKY	11/21	upstream reliability is '86.29856850715747'. current run reliability is '52.38095238095239'. drift is 33.91762 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ShadowLinkingReplicationTests&test_method=test_replication_basic
TimeQueryTest	test_timequery_with_local_gc	null	integration	https://buildkite.com/redpanda/redpanda/builds/73074#019986ed-9d66-4ebf-aa29-20ec50d98f30	FLAKY	19/21	upstream reliability is '96.41509433962264'. current run reliability is '90.47619047619048'. drift is 5.9389 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=TimeQueryTest&test_method=test_timequery_with_local_gc

[vbotbuildovich]

/backport v25.2.x

[vbotbuildovich]

/backport v25.1.x

[vbotbuildovich]

Failed to create a backport PR to v25.1.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-27758-v25.1.x-557 remotes/upstream/v25.1.x
git cherry-pick -x ec0f03fb29

Workflow run logs.

[vbotbuildovich]

Failed to create a backport PR to v25.2.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-27758-v25.2.x-431 remotes/upstream/v25.2.x
git cherry-pick -x ec0f03fb29

Workflow run logs.