Remove unnecessary `doc` directory deletion

This commit changes the behavior such the path_params now default to
UTF8 just like regular parameters. This also changes the behavior such
that if a path parameter contains invalid UTF8 it returns a 400 bad
request. Previously the behavior was to encode the path params as binary
but that's not the same as query params.

So this commit makes path params behave the same as query params.

It's important to test with a path that's encoded as binary because
that's how paths are encoded from the socket. The test that was altered
was changed to make the behavior for bad encoding the same as query
params. We want to treat path params the same as query params. The params
in the test are invalid UTF8 so they should return a bad request.

Fixes #29669

*Eileen M. Uchitelle, Aaron Patterson, & Tsukuru Tanimichi*

[ci skip] Fix rails_command comments

Fix rubocop issues

Remove redundant `unless current_adapter?(:OracleAdapter)`

Since 553b6958, `doc` directory is not created in application.

[ci skip]

Closes #30012

And make reference to `Relation`.

Fix typo in assert_changes error message

Merge pull request #30016 from albertoalmagro/set-ruby-version-in-gemfile-and-ruby-version-by-default

Set Ruby version in Gemfile and .ruby-version by default

Avoid duplicate clauses when using #or

Fix test directory to correct path

Fix testing helpers that use Action View's capturing helpers (e.g. content_for)

[ Orhan Toy & Kasper Timm Hansen ]

Fix `warning: method redefined;`

Change http postgresql.org links to https [ci skip]

It seems that it accepts only HTTPS connections.
Ref: https://github.com/postgres/postgres/commit/7f77cbd996855a06fb742ea11adbe55c42b48fe2

Together, fix to the following lint violation.

```
rails/actionview/test/ujs/public/test/data-confirm.js
  303:11  error  Strings must use singlequote  quotes

rails/actionview/test/ujs/public/test/data-remote.js
  414:32  error  Extra semicolon  semi

✖ 2 problems (2 errors, 0 warnings)
```

Use frozen string literal in actionpack/

Building `where_clause` in `UniquenessValidator` is no longer needed

Use `predicate_builder.build_bind_attribute` wherever possible

Rails 5.1 introduce an `ActiveSupport::Duration::Scalar` class as
a wrapper around a numeric value as a way of ensuring a duration
was the outcome of an expression. However the implementation was
missing support for modulo operations. This commit adds support
for those operations and should result in a duration being
returned from expressions involving them.

Fixes #29603 and #29743.

[ci skip] update routing guide

commit 4a3d295f3011e771cddead80de7497ca15d15c13
Author: Yauheni Dakuka <yauheni.dakuka@gmail.com>
Date:   Fri Jul 28 14:31:35 2017 +0300

    Update routing.md

commit 620a4ce47288e3ef6504290c78f931214968e7e3
Author: Yauheni Dakuka <yauheni.dakuka@gmail.com>
Date:   Fri Jul 28 14:19:29 2017 +0300

    [ci skip] update routing guide

[ci skip] update routing guide

For less duplicated code.

This fixes the following warning:

```
/tmp/d20170727-7039-kmdtb1/app/app/models/user.rb:5: warning: method redefined; discarding old model_name
rails/activemodel/lib/active_model/naming.rb:222: warning: previous definition of model_name was here
```

We were expecting those classes to be loaded when an association is
defined but they are not.

If you add a debugger on the first line of any of those classes and try
to define the corresponding association you will see that the classes
are not loaded.

Fixes #26273

Fix division where a duration is the denominator

PR #29163 introduced a change in behavior when a duration was
the denominator in a calculation - this was incorrect as dividing
by a duration should always return a `Numeric`. The behavior of
previous versions of Rails has been restored.

Fixes #29592.

Fix an AR test of schema dump when using Oracle