Add import course

[andreia]

Details

Add import course.

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Note

Medium Risk
Medium risk due to new background import path that creates multiple related records in a transaction and a schema-changing migration that alters an existing column type.

Overview
Adds an Import Course action to the courses list that uploads a CSV, stores it temporarily, and dispatches a queued ImportCourseFromCsv job to create a new course from the file.

Introduces CourseStepsImport (Laravel Excel) to parse supported CSV formats and create lessons/steps plus associated materials (video/image/link), including URL extraction/conversion for video embeds and fallback behavior when lesson names are missing.

Separately updates Video::provider detection to recognize more YouTube/Vimeo URL variants and return external otherwise, and adds a migration (change_name_to_text_on_lms_tests_table) to change lms_tests.name from string to text (with rollback). Tests and fixtures were added/updated to cover the new import and provider behaviors.

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[swilla]

This looks good!