test: cover additional listagg cases

[igorvoltaic]

resolves #10444

Problem

listagg marco does not cover all possible cases described in the docs

Solution

add more test cases

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

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[igorvoltaic]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.77%. Comparing base (33161a3) to head (24647d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10445      +/-   ##
==========================================
- Coverage   88.82%   88.77%   -0.05%     
==========================================
  Files         180      180              
  Lines       22584    22584              
==========================================
- Hits        20060    20049      -11     
- Misses       2524     2535      +11     

Flag	Coverage Δ
integration	85.99% <ø> (-0.13%)	⬇️
unit	62.15% <ø> (ø)

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

Components	Coverage Δ
Unit Tests	62.15% <ø> (ø)
Integration Tests	85.99% <ø> (-0.13%)	⬇️

[peterallenwebb]

@igorvoltaic Thank you for making dbt better!

[dbeatty10]

There could be adapters with a buggy implementation of listagg, and their CI could start breaking as a result if they inherit this test.

In that case, they'd need to do one of the following:

1. update their implementation to cover the edge case (recommended)
2. update their test definition to exclude those test cases (not recommended)
3. skip the test entirely (not recommended)