chore: rename testing classes as new versions became reserved

[seuros]

The build started to fail because SqliteRecord is reserved in the new version of sqlite3.

[Copilot]

Pull request overview

This PR renames testing classes from database-specific names (MysqlRecord, SqliteRecord) to more generic names (SecondaryRecord, LiteRecord) to avoid conflicts with reserved names in newer versions of Ruby/Rails. The changes are consistent across model files, schema files, test files, and configuration.

Changes:

• Renamed MysqlRecord → SecondaryRecord and SqliteRecord → LiteRecord across all model classes and test files
• Updated database table names from mysql_* → secondary_* and sqlite_* → lite_* in schema files
• Updated database configuration key from :sqlite → :lite
• Updated Ruby version from 3.4.7 to 3.4.8

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/test_helper.rb	Updated DatabaseCleaner configuration to use new record class names
test/dummy/db/sqlite_schema.rb	Renamed sqlite table definitions to lite
test/dummy/db/secondary_schema.rb	Renamed mysql table definitions to secondary
test/dummy/db/schema.rb	Updated multi-database test table names to use new naming convention
test/dummy/db/mysql_schema.rb	Removed deprecated mysql schema file
test/dummy/config/database.yml	Renamed database configuration key from sqlite to lite
test/dummy/app/models/sqlite_record.rb	Removed old SqliteRecord class definition
test/dummy/app/models/secondary_tag.rb	Updated class to inherit from SecondaryRecord
test/dummy/app/models/secondary_record.rb	Renamed class from MysqlRecord to SecondaryRecord
test/dummy/app/models/secondary_adoptable_tag.rb	Updated class to inherit from SecondaryRecord
test/dummy/app/models/memory_tag.rb	Updated class to inherit from LiteRecord
test/dummy/app/models/memory_adoptable_tag.rb	Updated class to inherit from LiteRecord
test/dummy/app/models/lite_record.rb	Added new LiteRecord class replacing SqliteRecord
test/closure_tree/parallel_test.rb	Updated to use LiteRecord connection methods
test/closure_tree/multi_database_test.rb	Updated all references from SqliteRecord/MysqlRecord to LiteRecord/SecondaryRecord
test/closure_tree/adopt_test.rb	Updated adopt test invocations to use new class names
lib/closure_tree/support.rb	Updated comment to reference SecondaryRecord instead of MysqlRecord
.tool-versions	Updated Ruby version from 3.4.7 to 3.4.8

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