[CONFLICT] [Backport stable-26-3-1] PR #47770: some decommission fixes, PR #48893: fix a crash on a tablet stuck in group assignment

[ydbot]

Changelog entry

some decommission fixes

---

fix a crash on a tablet stuck in group assignment

Description for reviewers

Original PR(s)

• PR some decommission fixes #47770
• PR fix a crash on a tablet stuck in group assignment #48893

Metadata

• Original PR author(s): @vporyadke
• Cherry-picked by: @vporyadke
• Related issues: Mute ydb/tests/functional/tenants/test_remove_storage_groups.py.test_remove_storage_group in main #47367

Conflicts Require Manual Resolution

This PR contains merge conflicts that require manual resolution.

Files with conflicts:

• ydb/core/mind/hive/hive_impl.cpp
• ydb/tests/functional/tenants/test_remove_storage_groups.py

How to resolve conflicts:

git fetch origin
git checkout --track origin/cherry-pick-stable-26-3-1-260819-084649
# Resolve conflicts in files
git add .
git commit -m "Resolved merge conflicts"
git push

After resolving conflicts:

1. Fix the PR title (remove [CONFLICT] if conflicts are resolved)
2. Mark PR as ready for review

Git Cherry-Pick Log

=== Cherry-picking 21ba0d6 ===
Auto-merging ydb/core/cms/console/console_tenants_manager.cpp
Auto-merging ydb/core/mind/hive/hive_impl.cpp
CONFLICT (content): Merge conflict in ydb/core/mind/hive/hive_impl.cpp
CONFLICT (modify/delete): ydb/tests/functional/tenants/test_remove_storage_groups.py deleted in HEAD and modified in 21ba0d623a2 (some decommission fixes (#47770)).  Version 21ba0d623a2 (some decommission fixes (#47770)) of ydb/tests/functional/tenants/test_remove_storage_groups.py left in tree.

error: could not apply 21ba0d623a2... some decommission fixes (#47770)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

=== Cherry-picking b54d51f ===
Auto-merging ydb/core/mind/hive/hive_impl.cpp
Auto-merging ydb/core/mind/hive/hive_ut.cpp
[cherry-pick-stable-26-3-1-260819-084649 3b2dd868a76] fix a crash on a tablet stuck in group assignment (#48893)
 Author: vporyadke <zalyalov@ydb.tech>
 Date: Wed Aug 5 14:48:44 2026 +0200
 2 files changed, 10 insertions(+), 1 deletion(-)

---

PR was created by cherry-pick workflow run

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[github-actions]

⚪ 2026-08-19 08:50:45 UTC Pre-commit check linux-x86_64-relwithdebinfo for ebb7958 has started.
⚪ 2026-08-19 08:53:32 UTC Artifacts will be uploaded here
⚪ 2026-08-19 08:55:25 UTC ya make is running...
🔴 2026-08-19 09:01:23 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2026-08-19 08:53:00 UTC Pre-commit check linux-x86_64-release-asan for ebb7958 has started.
⚪ 2026-08-19 08:53:19 UTC Artifacts will be uploaded here
⚪ 2026-08-19 08:54:45 UTC ya make is running...
🔴 2026-08-19 08:58:22 UTC Build failed, see the logs. Also see fail summary