chore(preaggr): Remove unused paramerers.

[cristipp]

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

N/A

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

• Removes unnecessary preAggregation parameter to methods of PreAggregationLoader.
• Removes unnecessary nested closure in PreAggregationLoader.refresh.

[codecov]

Codecov Report

Base: 81.63% // Head: 59.24% // Decreases project coverage by -22.38% ⚠️

Coverage data is based on head (6a02ad3) compared to base (22befff).
Patch coverage: 91.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4719       +/-   ##
===========================================
- Coverage   81.63%   59.24%   -22.39%     
===========================================
  Files         115      136       +21     
  Lines       15835    11168     -4667     
  Branches        0     2773     +2773     
===========================================
- Hits        12927     6617     -6310     
- Misses       2908     4045     +1137     
- Partials        0      506      +506     

Flag	Coverage Δ
cube-backend	59.24% <91.66%> (?)
cubesql	?

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

Impacted Files	Coverage Δ
...y-orchestrator/src/orchestrator/PreAggregations.ts	81.26% <91.66%> (ø)
...pile/engine/information_schema/postgres/pg_type.rs
...cubesql/cubesql/src/compile/rewrite/rules/split.rs
rust/cubesql/cubesql/src/sql/types.rs
rust/cubesql/cubesql/src/compile/context.rs
...pile/engine/information_schema/postgres/pg_enum.rs
rust/cubesql/cubesql/src/telemetry/mod.rs
rust/cubesql/cubesql/src/compile/engine/udf.rs
...gine/information_schema/postgres/character_sets.rs
rust/cubesql/cubeclient/src/apis/configuration.rs
... and 242 more

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