fix: add distinct aggregation limit error messages

[forshev]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #249

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.12500% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.88%. Comparing base (36016e6) to head (5573b1e).

Files with missing lines	Patch %	Lines
proxy/search/ingestor.go	0.00%	9 Missing and 3 partials ⚠️
storeapi/grpc_v1.go	0.00%	3 Missing and 3 partials ⚠️
frac/processor/eval_tree.go	55.55%	4 Missing ⚠️
frac/processor/search.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #250   +/-   ##
=======================================
  Coverage   71.88%   71.88%           
=======================================
  Files         199      199           
  Lines       14570    14585   +15     
=======================================
+ Hits        10473    10484   +11     
- Misses       3364     3366    +2     
- Partials      733      735    +2     

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