fix(cubesql): cover named IANA timezone in TIMESTAMPTZ wrapper pushdown

[mattheworford]

Check List

• Tests have been run in packages where changes have been 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

#11100

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 58.88%. Comparing base (d2ed904) to head (38144c7).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...bejs-schema-compiler/src/adapter/SnowflakeQuery.ts	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (d2ed904) and HEAD (38144c7). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (d2ed904)	HEAD (38144c7)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #11101       +/-   ##
===========================================
- Coverage   83.61%   58.88%   -24.73%     
===========================================
  Files         256      210       -46     
  Lines       78904    16873    -62031     
  Branches        0     3428     +3428     
===========================================
- Hits        65974     9936    -56038     
+ Misses      12930     6435     -6495     
- Partials        0      502      +502     

Flag	Coverage Δ
cube-backend	58.88% <0.00%> (?)
cubesql	?

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