refactor: remove main mapping id from migration fix

[larskemper]

resolves #13389

the main_mapping_id field is not needed anymore, so we can remove it

[Copilot]

Pull Request Overview

This PR refactors the swag_migration_fix table to use entity_id directly instead of referencing the mapping table via main_mapping_id. This simplifies the data model by removing an unnecessary join.

• Removed main_mapping_id field from SwagMigrationFixEntity and SwagMigrationFixDefinition
• Updated MigrationFixApplier SQL query to use entity_id directly instead of joining with the mapping table
• Added database migration to drop the main_mapping_id column and foreign key
• Updated all tests to use entity_id instead of main_mapping_id

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Migration/MigrationFix/SwagMigrationFixEntity.php	Removed mainMappingId property and its getter/setter methods
src/Migration/MigrationFix/SwagMigrationFixDefinition.php	Removed main_mapping_id field definition from the entity schema
src/Migration/Writer/MigrationFix/MigrationFixApplier.php	Simplified SQL query to query entity_id directly instead of joining with mapping table
src/Core/Migration/Migration1762436233RemoveMainMappingIdFromMigrationFix.php	Added migration to drop main_mapping_id column and its foreign key constraint
tests/unit/Migration/Writer/MigrationFix/MigrationFixTest.php	Updated test data to use entity_id instead of main_mapping_id
tests/integration/Migration/Writer/MigrationFix/MigrationFixApplierTest.php	Removed unnecessary mapping creation and updated to use entity_id directly in createFix method
tests/integration/Migration/MigrationFix/SwagMigrationEntityTest.php	Updated to retrieve and use entity_uuid from mapping instead of mapping id
tests/TableHelperTrait.php	Added helper methods for managing foreign keys (foreignKeyExists, addForeignKey, dropForeignKey)
tests/Core/Migration/Migration1762436233RemoveMainMappingIdFromMigrationFixTest.php	Added test for the new migration that verifies column and foreign key removal

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