ActionDispatch::IntegrationTest HTTP request methods will accept only
certain kwargs in the future. This test caused a deprecation warning
when running ActionPack tests. Added `params` and `headers` to fix.

Removing `#build_original_fullpath` because it is no longer
used by the Rails' source code or called in the `#call` method becasue
the previous commit now uses `fullpath` from Rack.

The method was nodoc'ed so it's safe to remove.

NOTE: I did this as a separate commit so if this does cause a problem
with engines etc reverting is easy.

In Rack, `#fullpath` checks if there is a query string and builds the
query correctly:

```
def path
  script_name + path_info
end

def fullpath
  query_string.empty? ? path : "#{path}?#{query_string}"
end
```

We can utilize this instead of manually building the fullpath because
they are the same result. This also reduces allocations in `#call`
because we don't need `build_original_fullpath` to create the paths and
query strings. We don't need to build `fullpath` twice.

[Fix Select tag Tests] Test correct use of multiple option for select tag

Fix test messages use directly true, false and nil instead of their symbol

Fixes #19389.

Updated MySQL documentation link to MySQL latest version 5.6 everywhere ...

Updated MySQL documentation link to latest version MySQL 5.6 [ci skip]

add foreign_key option to result of references column type [ci skip]

Changelog entry for removal of RACK_ENV fallback

[ci skip]

Updated MySQL documentation link for STRICT_ALL_TABLES [ci skip]

Don't fallback to RACK_ENV when RAILS_ENV is not present

3 commits were missing when we merged the PR, probably they were lost
when that branch was rebased against latest master.
This merge, contains those 3 commits.

bundle exec db:migrate rake was not working, with the new runner, before this commit

`bin/rails test` runner (rerun snippets, run tests by line, option documentation)

Add a new-line to the end of route method generated code.

ActiveRecord: Add a changelog entry for issue #17680. [ci skip]
Conflicts:
	activerecord/CHANGELOG.md

Active Record changelog pass [skip ci]

[ci skip] use true as value rather than symbol

[skip ci] Fixed typo in asset pipeline documentation

[ci skip] use false as value rather than symbol

Change commands in the Getting Started guide to use scripts in bin/ [ci skip]

[ci skip]

Fix regression on route method that was added by
bac812a7. The regression was that when
calling the `route` method, we were not appending a \n anymore.

[fixes #19316]

This is a better test for 51660f01. It is testing that the SQL is the
same before and after the previously leaky scope is called. Before if
`hotel.drink_designers` was called first then `hotel.recipes` would
incorrectly get the scope applied. We want to be sure that the
polymorphic hm:t association is not leaking into or affecting the
SQL for the hm:t association on `Hotel`.

The reason I couldn't do this before was because there was an issue with
the SQL getting cached and wanted to resolve that later and then fix the
test to be better. Because of the caching, this test requires that
`Hotel.reflect_on_association(:recipes).clear_association_scope_cache`
be called after the first call to `hotel.recipes` to clear the
assocation scope chain and not interfere with the rest of the test.