chore(query-orchestrator): set csvQuery method to protected

[wolfeeeg]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Issue Reference this PR resolves

[For example #12]

Description of Changes Made (if issue reference is not provided)

[Description goes here]

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6b1fadb) 46.98% compared to head (fad19ab) 46.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6412   +/-   ##
=======================================
  Coverage   46.98%   46.98%           
=======================================
  Files         152      152           
  Lines       20248    20248           
  Branches     5187     5187           
=======================================
  Hits         9514     9514           
  Misses       9896     9896           
  Partials      838      838           

Flag	Coverage Δ
cube-backend	46.98% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...-query-orchestrator/src/orchestrator/QueryCache.ts	72.83% <0.00%> (ø)

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