Fixes #11497

As `ActiveRecord::ConnectionAdapters::ConnectionManagement` middleware does not rescue from Exception (but only from StandardError),
the Connection Pool quickly runs out of connections when multiple erroneous Requests come in right after each other.

Recueing from all exceptions and not just StandardError, fixes this behaviour.

Fix an issue where Journey was failing to clear the named routes hash when the
routes were reloaded and since it doesn't overwrite existing routes then if a
route changed but wasn't renamed it kept the old definition. This was being
masked by the optimised url helpers so it only became apparent when passing an
options hash to the url helper.

Rename the I18n keys for associations' restrict_dependent_destroy errors

Removed information about creating database [ci skip]

Rails 4.0 release notes. Explain major features added and removed.

- As default index page is no longer in public folder, rails hits the
  welcome controller in railties for index action
- If the database is not created or username and password are
  incorrect in database.yml, those errors are first shown before index
  action succeeds
- welcome#index succeeds iff the database is created with correct
  details in database.yml
- So this information about creating database is not required in the
  index template

Extract verbs array from helper to a contant

Fix test name typos

Upgrade guide. Renaming Indexes on tables. [ci skip]

https://github.com/rails/rails/commit/39eef1a565ef02e4dabc0811ef1bf4547ff9a60e#commitcomment-3672522

Closes #11498.

remove duplication in concern_test

Revert "Fix SyntaxError in guides sample code"

Thanks @fxn

This reverts commit f573df32.

The original idea of this documentation was to showcase the feature
where you can remove some only queries attributes with a single
key-value pair.

Closes rails/rails#11362

Thanks @egilburg

[ci skip]

[ci skip]

fixes the test case of that plugins

grammar fix in upgrade documentation

Use latest mysql2.

Fixes #11457

Fixed README link in API

Improve ActiveRecord::QueryMethods#includes docs [ci skip]

It's not immediately clear whether you can pass in multiple relations or
not. After going through the code a bit, I saw that the arguments are
just appended to an array. Also, added nested relations example.

[ci skip]

fixes plugin test for tutorial [ci skip]

[ci skip]

Update bcrypt-ruby stable version to 3.1