Bug fixes

start-all.sh --target-directory option have error in its documentation #2398
Some panels in the OS dashboard do not respect the DC filter #2396
Unknown Alternator OP - BatchGetItemSize #2393
Compression-related panels are confusing #2392
Using stack graph for active read is confusing #2389
Row and Partitions insertions are measured in read/sec #2386
The latencies Legend format are confusing #2383
scylla_io_queue_flow_ratio graph is inconvenient #2382
Add batch latency and batch size metrics to Alternator dashboard #2380
Alternator OPs are not representative of real ops - in case of BatchGetItem and similar batch ops area/alternator #2374

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