Mute ydb/core/tx/schemeshard/ut_export_reboots_s3 2 tests in main

[ydbot]

Mute:
ydb/core/tx/schemeshard/ut_export_reboots_s3/TExportToS3WithRebootsTests.CancelOnSingleShardTableWithChangefeed
ydb/core/tx/schemeshard/ut_export_reboots_s3/TExportToS3WithRebootsTests.ShouldSucceedOnSingleShardTableWithUniqueIndex

Branch:
main

Add line to muted_ya.txt:

ydb/core/tx/schemeshard/ut_export_reboots_s3 TExportToS3WithRebootsTests.CancelOnSingleShardTableWithChangefeed
ydb/core/tx/schemeshard/ut_export_reboots_s3 TExportToS3WithRebootsTests.ShouldSucceedOnSingleShardTableWithUniqueIndex

Owner: TEAM:@ydb-platform/system-infra

Read more in mute_rules.md

Summary history:
TExportToS3WithRebootsTests.CancelOnSingleShardTableWithChangefeed: Passed(11-09)->Flaky(11-10) last 25 days, at 2025-11-09:2025-11-12: success_rate 97.5%, p-119, f-3, m-0, s-0, total-122
TExportToS3WithRebootsTests.ShouldSucceedOnSingleShardTableWithUniqueIndex: Flaky(11-12)->Passed(11-09)->Flaky(11-11) last 3 days, at 2025-11-09:2025-11-12: success_rate 97.5%, p-116, f-3, m-0, s-0, total-119

Test run history: link

More info in dashboard

[ydbot]

All tests have been unmuted:

• Test ydb/core/tx/schemeshard/ut_export_reboots_s3/TExportToS3WithRebootsTests.CancelOnSingleShardTableWithChangefeed
• Test ydb/core/tx/schemeshard/ut_export_reboots_s3/TExportToS3WithRebootsTests.ShouldSucceedOnSingleShardTableWithUniqueIndex