[6.2] Use text column for finder routes

[MacJoom]

Summary of Changes

Change the Smart Search #__finder_links.route column from varchar(400) to ext for MySQL and PostgreSQL.

This prevents Smart Search indexing from failing when generated routes exceed the previous 400 character limit.

Supersedes #44414.

Testing Instructions

Use a site with article aliases close to 400 characters and run the Smart Search indexing process from Components, Smart Search, Index.

Actual result BEFORE applying this Pull Request

The indexing process can fail with a database error similar to Data too long for column 'route' at row 1.

Expected result AFTER applying this Pull Request

The index is built without failing because of long route values.

Link to documentations

No documentation changes needed.

[brianteeman]

I have tested this item ✅ successfully on 07dca15

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