Mute ydb/core/viewer/tests 2 tests in main

[ydbot]

Mute:
ydb/core/viewer/tests/test.py.TestViewer.test_topic_data
ydb/core/viewer/tests/test.py.TestViewer.test_topic_data_cdc

Branch:
main

Add line to muted_ya.txt:

ydb/core/viewer/tests test.py.TestViewer.test_topic_data
ydb/core/viewer/tests test.py.TestViewer.test_topic_data_cdc

Owner: TEAM:@ydb-platform/ui-backend

Read more in mute_rules.md

Summary history:
test.py.TestViewer.test_topic_data: Muted Flaky(10-13)->no_runs(10-16) last 1 days, at 2025-10-13:2025-10-16: success_rate 33.3%, p-19, f-0, m-38, s-0, total-57
test.py.TestViewer.test_topic_data_cdc: Muted Flaky(10-13)->Muted Stable(10-14)->Muted Flaky(10-15)->no_runs(10-16) last 1 days, at 2025-10-13:2025-10-16: success_rate 85.3%, p-29, f-0, m-5, s-0, total-34

Test run history: link

More info in dashboard