Bilog FIFO automation

[TejasC88]

Coverage mapping

Plan section What the tests do
1 Creation
FIFO default, InIndex default, fifo shard bounds vs index shards
2 Object ops
PUT ADD, DELETE DEL, multipart, mixed ops
3 Versioned
OLH link, epoch increment, delete marker, unlink, secondary epoch match
4 CLI
bilog list, --shard-id, trim then new write
5 Sync disable
SYNCSTOP, writes stay local, RESYNC catch-up
6 Reshard
FIFO→new gen, InIndex→FIFO upgrade, old gen cleanup after trim
7 Index repair
Remove omap key / head object, bucket check --fix emits ADD/DEL
8 Multisite
PUT sync, full sync, zone outage, versioned OLH, trim while secondary lags
9 Crash
Orphaned FIFO ADD, trim-before-consume then retry, OSD pause → 5xx
10/11 InIndex
PUT/DELETE/versioned/trim/status still work; no FIFO OIDs
S1–S5 Scale
Throughput vs InIndex, 500k sync, 2h trim, reshard-under-write, active-active disconnects