[v25.3.x] [ENG-724] rpk: add support of roles for cloud clusters

[vbotbuildovich]

Backport of PR #29162

[vbotbuildovich]

Retry command for Build#78817

please wait until all jobs are finished before running the slash command

/ci-repeat 1
skip-redpanda-build
skip-units
skip-rebase
tests/rptest/tests/datalake/datalake_dlq_test.py::DatalakeDLQTest.test_dlq_table_for_mixed_records@{"catalog_type":"rest_jdbc","cloud_storage_type":1,"query_engine":"spark"}

[vbotbuildovich]

CI test results

test results on build#78817

test_class	test_method	test_arguments	test_kind	job_url	test_status	passed	reason	test_history
DatalakeDLQTest	test_dlq_table_for_mixed_records	{"catalog_type": "rest_jdbc", "cloud_storage_type": 1, "query_engine": "spark"}	integration	https://buildkite.com/redpanda/redpanda/builds/78817#019ba3da-34d0-4d18-a5bf-b492fe4006e6	FLAKY	9/11	Test FAILS after retries.Significant increase in flaky rate(baseline=0.0000, p0=0.0000, reject_threshold=0.0100)	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=DatalakeDLQTest&test_method=test_dlq_table_for_mixed_records

[r-vasquez]

/ci-repeat 1
skip-redpanda-build
skip-units
skip-rebase
tests/rptest/tests/datalake/datalake_dlq_test.py::DatalakeDLQTest.test_dlq_table_for_mixed_records@{"catalog_type":"rest_jdbc","cloud_storage_type":1,"query_engine":"spark"}