Mute ydb/core/kqp/ut/indexes 2 tests in main

[ydbot]

Mute:
ydb/core/kqp/ut/indexes/KqpMultishardIndex.WriteIntoRenamingSyncIndex
ydb/core/kqp/ut/indexes/KqpMultishardIndex.SecondaryIndexSelectNull

Branch:
main

Add line to muted_ya.txt:

ydb/core/kqp/ut/indexes KqpMultishardIndex.WriteIntoRenamingSyncIndex
ydb/core/kqp/ut/indexes KqpMultishardIndex.SecondaryIndexSelectNull

Owner: TEAM:@ydb-platform/qp

Read more in mute_rules.md

Summary history:
KqpMultishardIndex.WriteIntoRenamingSyncIndex: Flaky(11-05)->Passed(11-04)->Flaky(11-06) last 1 days, at 2025-11-04:2025-11-07: success_rate 96.5%, p-109, f-4, m-0, s-0, total-113
KqpMultishardIndex.SecondaryIndexSelectNull: Flaky(11-05)->Passed(11-04)->Flaky(11-06) last 1 days, at 2025-11-04:2025-11-07: success_rate 97.3%, p-109, f-3, m-0, s-0, total-112

Test run history: link

More info in dashboard

[ydbot]

Some tests have been unmuted:

• Test ydb/core/kqp/ut/indexes/KqpMultishardIndex.SecondaryIndexSelectNull