Despite being mentioned in the `AssertOffense` documentation, `assert_no_corrections` was not supported:
https://github.com/rubocop/rubocop-minitest/blob/v0.35.0/lib/rubocop/minitest/assert_offense.rb#L58-L72

This PR makes `assert_no_corrections` supported in accordance with the documentation.

Make `AssertOffense` support `assert_no_corrections`

Fix readme CI badge

This commit disables `Performance/StringIdentifierArgument` under the `test/**` directory
to suppress the following detection:

```console
test/rubocop/cop/minitest/assert_match_test.rb:7:19: C: [Correctable] Performance/StringIdentifierArgument:
Use :"test_registers_offense_when_using_assert_with_#{matcher}" instead of "test_registers_offense_when_using_assert_with_#{matcher}".
    define_method("test_registers_offense_when_using_assert_with_#{matcher}") do
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

This setting is because the code in this directory is test code, and performance is not of utmost importance.
Additionally, `:"Use ..."` is not necessarily more readable than `"Use ..."`.

This commit suppresses the following new RuboCop offenses:

```console
$ bundle exec rubocop
(snip)

rubocop-minitest.gemspec:35:8: C: [Correctable] Gemspec/AddRuntimeDependency:
Use add_dependency instead of add_runtime_dependency.
  spec.add_runtime_dependency 'rubocop', '>= 1.61', '< 2.0'
       ^^^^^^^^^^^^^^^^^^^^^^
rubocop-minitest.gemspec:36:8: C: [Correctable] Gemspec/AddRuntimeDependency:
Use add_dependency instead of add_runtime_dependency.
  spec.add_runtime_dependency 'rubocop-ast', '>= 1.31.1', '< 2.0'
       ^^^^^^^^^^^^^^^^^^^^^^

136 files inspected, 2 offenses detected, 2 offenses autocorrectable
```

Follow up rubocop/rubocop#13032 and
rubocop/rubocop#9471.

This PR suppresses deprecation warning for `Minitst/MultipleAssertions`.

…nitest_multiple_assertions

Suppress deprecation warning for `Minitst/MultipleAssertions`