[Feature] Integration test runner

[sakari-malkki]

Adds new Px.Utils.IntegrationTest project with a small database with both valid and invalid px and alias files. Runs predetermined tests for validation, full and limited data query and computation processes.

Integration test run added to CI.yml.

Fixed few mostly alias file and database related validation issues.

[Copilot]

Pull request overview

Adds a CI-integrated console runner for validating PX fixtures, data queries, and matrix calculations, alongside database-validation fixes.

Changes:

• Adds deterministic integration scenarios and fixtures.
• Improves alias-file, empty-database, path, and concurrency handling.
• Adds CI execution, tests, and architecture documentation.

Reviewed changes

Copilot reviewed 49 out of 50 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
Px.Utils/Validation/ValidationFeedback.cs	Synchronizes feedback writes.
Px.Utils/Validation/Enums.cs	Adds database feedback rules.
Px.Utils/Validation/DatabaseValidation/DatabaseValidatorFunctions.cs	Improves paths and alias matching.
Px.Utils/Validation/DatabaseValidation/DatabaseValidator.cs	Adds alias encoding and empty-database handling.
Px.Utils/Validation/ContentValidation/ContentValidator.cs	Handles single-axis data dimensions.
Px.Utils/Px.Utils.csproj	Bumps version and adds Ude.
Px.Utils.UnitTests/Validation/PxFileValidationTests/PxFileValidationTests.cs	Tests single-axis PX files.
Px.Utils.UnitTests/Validation/Fixtures/PxFileFixtures.cs	Adds single-axis fixtures.
Px.Utils.UnitTests/Validation/DatabaseValidation/MockFileSystem.cs	Extends database mocks.
Px.Utils.UnitTests/Validation/DatabaseValidation/DatabaseValidatorTests.cs	Tests new database behavior.
Px.Utils.sln	Registers integration project.
Px.Utils.IntegrationTest/TestResult.cs	Defines scenario results.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_ras_pxt_13m4.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_kttav_pxt_11b6.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_klts_pxt_11wv.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_kihi_pxt_141f.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_khi_pxt_122q.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_jate_pxt_jate001.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_cvts_pxt_13vr.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_atp_pxt_11n3.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/statfin_akay_pxt_013.px	Adds valid PX fixture.
Px.Utils.IntegrationTest/test-database/valid-files/Alias_sv.txt	Adds Swedish alias fixture.
Px.Utils.IntegrationTest/test-database/valid-files/Alias_fi.txt	Adds Finnish alias fixture.
Px.Utils.IntegrationTest/test-database/valid-files/Alias_en.txt	Adds English alias fixture.
Px.Utils.IntegrationTest/test-database/invalid-files/statfin_vpa_pxt_132.px	Adds invalid PX fixture.
Px.Utils.IntegrationTest/test-database/invalid-files/statfin_tvki_pxt_141r.px	Adds invalid PX fixture.
Px.Utils.IntegrationTest/test-database/invalid-files/statfin_tvki_pxt_141p.px	Adds invalid PX fixture.
Px.Utils.IntegrationTest/test-database/invalid-files/statfin_opiskt_pxt_13nm.px	Adds invalid PX fixture.
Px.Utils.IntegrationTest/test-database/invalid-files/Alias_fi.txt	Adds invalid-set alias.
Px.Utils.IntegrationTest/test-database/invalid-files/Alias_en.txt	Adds encoded alias fixture.
Px.Utils.IntegrationTest/test-database/Alias_sv.txt	Adds root Swedish alias.
Px.Utils.IntegrationTest/test-database/Alias_fi.txt	Adds root Finnish alias.
Px.Utils.IntegrationTest/test-database/Alias_en.txt	Adds root English alias.
Px.Utils.IntegrationTest/Scenarios/DataScenarios.cs	Runs validation and query scenarios.
Px.Utils.IntegrationTest/Scenarios/CalculationScenario.cs	Runs matrix calculations.
Px.Utils.IntegrationTest/PxLoader.cs	Loads metadata and data.
Px.Utils.IntegrationTest/Px.Utils.IntegrationTest.csproj	Configures integration executable.
Px.Utils.IntegrationTest/Program.cs	Defines executable entry point.
Px.Utils.IntegrationTest/IntegrationTestRunner.cs	Coordinates scenarios and exit codes.
Px.Utils.IntegrationTest/ExpectedResults/validation-results.json	Defines validation expectations.
Px.Utils.IntegrationTest/ExpectedResults/limited-query-results.json	Defines mapped-read expectations.
Px.Utils.IntegrationTest/ExpectedResults/full-query-results.json	Defines full-read expectations.
Px.Utils.IntegrationTest/ExpectedResults/ExpectationModels.cs	Models expectation documents.
Px.Utils.IntegrationTest/Assertions/IntegrationAssert.cs	Compares scenario results.
Px.Utils.IntegrationTest/Assertions/DifferenceFormatter.cs	Formats comparison failures.
docs/README.md	Documents runner usage.
docs/architecture.testing.md	Documents integration testing.
docs/architecture.overview.md	Adds project architecture entry.
.github/workflows/CI.yml	Runs integration tests in CI.

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