Starting ruby-lsp-rails fails if database doesn't exist

[andyw8]

In #503 we added a check for pending migrations when starting ruby-lsp-rails.

If the database doesn't exist, this results in a failure which causes Ruby LSP to stop responding.

On code-db (an internal Shopify app) I can reproduce by running rake db:drop then starting Ruby LSP.

2024-11-07 10:00:53.844 [info] (code-db) Request  failed:

2024-11-07 10:00:53.844 [info] (code-db) /Users/andyw8/.gem/ruby/3.3.1/gems/activerecord-7.2.2/lib/active_record/connection_adapters/trilogy_adapter.rb:34:in `rescue in new_client': We could not find your database: code_db_development. Available database configurations can be found in config/database.yml. (ActiveRecord::NoDatabaseError)