PMM-14360 Disk I/O Total output is incorrect

[igroene]

Applied the changes from upstream PR percona/grafana-dashboards#1787 to this repo.

Updated files:

• MongoDB/MongoDB_InMemory_Details.json
• MongoDB/MongoDB_Instance_Summary.json
• MongoDB/MongoDB_ReplSet_Summary.json
• MongoDB/MongoDB_WiredTiger_Details.json

What changed:

• Replaced the broken Total disk I/O PromQL expression in each dashboard.
• The new query correctly computes:
  • reads: container fs reads or page-in fallback
  • writes: container fs writes or page-out fallback
  • total: reads + writes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.46%. Comparing base (38c9b56) to head (dcca9c9).

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5222      +/-   ##
==========================================
- Coverage   47.79%   47.46%   -0.34%     
==========================================
  Files         410      540     +130     
  Lines       41981    44325    +2344     
  Branches        0      584     +584     
==========================================
+ Hits        20066    21038     +972     
- Misses      19940    21248    +1308     
- Partials     1975     2039      +64     

Flag	Coverage Δ
admin	35.80% <ø> (ø)
agent	53.36% <ø> (+0.01%)	⬆️
unittests	41.38% <ø> (?)

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