fix: Ensure appropriate quoting for case sensitive tenant names

[bartventer]

Fixes case-sensitive tenant name handling in PostgreSQL and MySQL drivers by properly quoting schema and database names in path operations.

Changes

• postgres/schema/schema.go: Use QuoteTo() in SetSearchPath() function
• mysql/schema/schema.go: Use QuoteTo() in UseDatabase() function
• Added test coverage for case-sensitive tenant names to prevent regression (see TestIssue100 comments below)

Fixes #100

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[bartventer]

Tests fail as expected for TestPostgresConformance/MigrateTenantModels/Issue100_Quoting.
See:

• https://github.com/bartventer/gorm-multitenancy/actions/runs/16221250096/job/45802059870?pr=101#step:5:7635
• https://github.com/bartventer/gorm-multitenancy/actions/runs/16221250096/job/45802059864?pr=101#step:5:7336
• https://github.com/bartventer/gorm-multitenancy/actions/runs/16221250096/job/45802059874?pr=101#step:5:7363

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.25%. Comparing base (078c244) to head (a14456b).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
mysql/schema/schema.go	71.42%	1 Missing and 1 partial ⚠️
postgres/schema/schema.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   81.22%   81.25%   +0.02%     
==========================================
  Files          35       35              
  Lines        1273     1275       +2     
==========================================
+ Hits         1034     1036       +2     
  Misses        190      190              
  Partials       49       49              

Flag	Coverage Δ
combined	81.25% <73.33%> (+0.02%)	⬆️

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[bartventer]

Reviewed and approved.