[dbnode] Validate index segments and properly mark fulfilled ranges

[notbdu]

What this PR does / why we need it:

Validate and remove corrupted index segments. Only mark fulfilled ranges for default index volume type persisted blocks.

Also adds an additional test to cover bootstrapping partial shards in index segments. This is the node leave case where the peers bootstrapper fetches and persists data for additional shards and crashes before writing index data to disk.

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:

NONE

Does this PR require updating code package or user-facing documentation?:

NONE

[codecov[bot]]

Codecov Report

Merging #2995 (e3e33da) into master (37665c0) will increase coverage by 0.0%. Report is 906 commits behind head on master. The diff coverage is 74.3%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #2995    +/-   ##
=======================================
  Coverage    72.3%   72.3%            
=======================================
  Files        1078    1078            
  Lines       99413   99537   +124     
=======================================
+ Hits        71914   72022   +108     
- Misses      22509   22519    +10     
- Partials     4990    4996     +6     

Flag	Coverage Δ
aggregator	75.9% <ø> (ø)
cluster	85.2% <ø> (+0.1%)	:arrow_up:
collector	84.3% <ø> (ø)
dbnode	78.8% <74.3%> (-0.1%)	:arrow_down:
m3em	74.4% <ø> (ø)
m3ninx	73.1% <ø> (-0.1%)	:arrow_down:
metrics	19.9% <ø> (ø)
msg	74.1% <ø> (+0.5%)	:arrow_up:
query	67.4% <ø> (ø)
x	80.2% <ø> (+<0.1%)	:arrow_up:

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