SDSTOR-21760: Fix table not found issue during index recovery

[yuwmao]

Journal–table metadata mismatch due to CP vs destroy table ordering

Here is the issue description:
A split hits crash flip and marks its parent buffer with m_crash_flag_on during transact_bufs (src/lib/index/wb_cache.cpp:237-247). The same logical window removes the table: index_table::destroy() immediately removes its superblock from meta via MetaBlkService::remove_sub_sb (src/include/homestore/index/index_table.hpp:135-147 →
src/lib/meta/meta_blk_service.cpp:872+).
CP flush later starts and writes the txn_journal to meta first, then begins flushing dirty buffers; when the flagged parent buffer is reached, it crashes (src/lib/index/wb_cache.cpp:860-871, 896-903). On restart, recovery replays the persisted txn_journal and attempts to repair the table by ordinal, but the table superblock is gone and the table isn’t loaded → HS_DBG_ASSERT in repair_index_node (src/lib/index/index_service.cpp:205-212).

Key ordering rules that cause the mismatch
- Table destroy persistence is immediate at destroy(): meta superblock is removed synchronously (not tied to CP).
- Index CP flush ordering is fixed: (1) persist txn_journal; (2) flush dirty buffers; crash can occur at (2).
- Thus it’s possible to have a persisted journal entry for a table whose superblock was already removed.

Solution:
Trigger cp flush when deleting index table to force separate the deletion and other modification.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.15%. Comparing base (1a0cef8) to head (d590f42).
⚠️ Report is 327 commits behind head on master.

Files with missing lines	Patch %	Lines
src/include/homestore/index/index_table.hpp	0.00%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #877      +/-   ##
==========================================
- Coverage   56.51%   48.15%   -8.37%     
==========================================
  Files         108      110       +2     
  Lines       10300    12905    +2605     
  Branches     1402     6207    +4805     
==========================================
+ Hits         5821     6214     +393     
+ Misses       3894     2573    -1321     
- Partials      585     4118    +3533     

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