no_color! is already defined in [`Rails::Command::Behavior`][behavior],
which gets [included into `Rails:Generators`][include]. This duplication
came about in 6813edc7 when we introduced the Thor command structure.

We have [test coverage][] to ensure this method still behaves correctly
on `Rails:Generators`.

[behavior]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/lib/rails/command/behavior.rb#L12-L14
[include]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/lib/rails/generators.rb#L18
[test coverage]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/test/generators_test.rb#L163-L168

Add tests for selecting aggregrates

This hack prevails everywhere in the codebase by being copy & pasted, and it's actually not a negative thing but a necessary thing for framework implementors,
so it should better have a name and be a thing.

And with this commit, activesupport/test/abstract_unit.rb now doesn't silently autoload AS::TestCase,
so we're ready to establish clearner environment for running AS tests (probably in later commits)

It's used everywhere, clean and mature enough

Deduplicate joins values

#36805 have one possible regression that failing deduplication if
`joins_values` have complex order (e.g. `joins_values = [join_node_a,
:comments, :tags, join_node_a]`).

This fixes the deduplication to take it in the first phase before
grouping.

These tests verifies that aggregates like `AVG` can be selected as
"virtual attributes" on Active Record models and have the correct
column type.

Added missing comment notation for the example of form_with in form_helpers.md documentation. [ci skip]

Added missing comment notation for the example of form_with in form_helpers.md documentation. [ci skip]

This causes
  "NameError: undefined local variable or method `nsec' for #<DateTime:0x0000559163cdd878>"

In most cases it works now without explicit require because it's accidentally required through
active_support/core_ext/date_and_time/calculations.rb where we still call `try`,
but that would stop working if we changed the Calculations implementation and remove the require call there.

and Git taught me that this crap was added via this commit... https://github.com/rails/rails/commit/68db6bc431fbff0b2291f1f60ccf974b4eece596

Fixed a typo in documentation example of activerecord database configuration. [ci skip]

- The example has sqlite3 adpater in database.yml, whereas configuration object had incorrectly specified mysql2 in documentation.

This fixes the following warnings.

```
actionmailer/test/base_test.rb:272: warning: method redefined; discarding old welcome
actionmailer/test/base_test.rb:260: warning: previous definition of welcome was here
```

Upload filename and disposition for Azure

Prevent error on transliterate with frozen strings

Upload with filename and disposition for S3

Fix db:seed

The `rake db:seed` command was broken for the primary environment if the
application is using multiple databases. We never implemented `rake
db:seed` for other databases (coming soon), but that shouldn't break the
default case.

The reason this was broken was because `abort_if_pending_migrations`
would loop through the configs for all databases and check for
migrations but would leave the last established connection. So `db:seed`
was looking in the wrong database for the table to seed.

This PR doesn't fix the fact that `db:seed` doesn't work for multiple
databases but does fix the default case.

Fixes #36817
Co-authored-by: NJohn Crepezzi <john.crepezzi@gmail.com>

ActiveSupport::Inflector.transliterate mutates strings by changing encodings. Prior to this commit passing a frozen string would raise a `FrozenError`. This change duplicates the internal string, if frozen, before transliterating.