fix(@cubejs-client/core): add missing Series.shortTitle typing

[euljr]

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

Following update for #5836

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

Hello Cube team 👋 ,

When testing, I was using only the .seriesNames and didn't notice that the .series method had a separate return type, so I missed adding the shortTitle property typing in the Series.

This PR adds this missing type.

Thank you so much for reviewing the other PR, and sorry for the mistake.

I don't think this needs to be merged soon (seriesNames is enough on our side), this typing will solve the other issue by exposing it correctly though.

[codecov]

Codecov Report

Base: 82.13% // Head: 41.05% // Decreases project coverage by -41.07% ⚠️

Coverage data is based on head (8698b46) compared to base (5f63c02).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5860       +/-   ##
===========================================
- Coverage   82.13%   41.05%   -41.08%     
===========================================
  Files         139      149       +10     
  Lines       18910    19553      +643     
  Branches        0     5090     +5090     
===========================================
- Hits        15532     8028     -7504     
- Misses       3378    10705     +7327     
- Partials        0      820      +820     

Flag	Coverage Δ
cube-backend	41.05% <ø> (?)
cubesql	?

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

Impacted Files	Coverage Δ
rust/cubesql/pg-srv/src/buffer.rs
...cubesql/cubesql/src/compile/rewrite/rules/split.rs
rust/cubesql/cubesql/src/sql/postgres/shim.rs
.../models/v1_load_request_query_filter_logical_or.rs
rust/cubesql/cubesql/src/bin/cubesqld.rs
.../cubesql/cubeclient/src/models/v1_meta_response.rs
...ile/engine/information_schema/postgres/pg_stats.rs
...ine/information_schema/postgres/testing_dataset.rs
rust/cubesql/cubesql/src/compile/error.rs
...engine/information_schema/postgres/pg_attribute.rs
... and 278 more

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