fix: DH-17599: Change illegal characters to underscores in variable names

[vbabich]

• Add makeVariableName method to create valid variable names
• Add/update unit tests.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.83%. Comparing base (0f4f238) to head (dcbaa80).

Files with missing lines	Patch %	Lines
packages/console/src/csv/CsvInputBar.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2409   +/-   ##
=======================================
  Coverage   46.83%   46.83%           
=======================================
  Files         711      711           
  Lines       39307    39310    +3     
  Branches     9822     9822           
=======================================
+ Hits        18408    18411    +3     
  Misses      20888    20888           
  Partials       11       11           

Flag	Coverage Δ
unit	46.83% <85.71%> (+<0.01%)	⬆️

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[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

packages/utils/src/DbNameValidator.ts:76

• [nitpick] The removal of the global ('g') flag from TABLE_NAME_PATTERN appears intentional since the pattern is anchored, but please ensure this change does not affect any multi-match behavior expected in other contexts.

const TABLE_NAME_PATTERN = /^[a-zA-Z_$][a-zA-Z0-9_$\-+@]*$/;

[bmingles]

LGTM