Update functional tests to use the PSR NullLogger

This avoids using the deprecated NullLogger in tests.
Remove usages of deprecated constants
Replace usages of the deprecated TypeTestCase by the new one
Fix phpdoc and coding standards

This removes the unused use statements which were not catched by
PHP-CS-Fixer because of string occurences. It also fixes some invalid
phpdoc (scalar is not recognized as a valid type for instance).
Fix the implementation of deprecated Locale classes

The ICU component does not exist anymore.
minor #13160 Replace usages of the deprecated TypeTestCase by the new one (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Replace usages of the deprecated TypeTestCase by the new one

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

I'm applying this in 2.3 to make merging branches easier. This is especially needed for 2.7 because of deprecation warnings added in #13060

Commits
-------

e6fa0ea Replace usages of the deprecated TypeTestCase by the new one
minor #13159 Update functional tests to use the PSR NullLogger (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Update functional tests to use the PSR NullLogger

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This avoids using the deprecated NullLogger in tests.

I'm applying this in 2.3 to make merging branches easier. This is especially needed for 2.7 because of deprecation warnings added in #13060 (tests are failing in this PR currently because of that)

Commits
-------

30cff26 Update functional tests to use the PSR NullLogger
minor #13161 Remove usages of deprecated constants (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Remove usages of deprecated constants

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This removes the usage of deprecated constants in our code.

I'm applying this in 2.3 to make merging branches easier. This is especially needed for 2.7 because of deprecation warnings added in #13060 (warnings are triggered in this PR because of these usages)

Commits
-------

6c00c22 Remove usages of deprecated constants
minor #13162 Fix phpdoc and coding standards (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Fix phpdoc and coding standards

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

This removes the unused use statements which were not catched by PHP-CS-Fixer because of string occurences. It also fixes some invalid phpdoc (scalar is not recognized as a valid type for instance).

This is complementary to https://github.com/symfony/symfony/pull/13134

Commits
-------

8cc3f6a Fix phpdoc and coding standards
Updated generateSql tool
minor #13165 Fix the implementation of deprecated Locale classes (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Fix the implementation of deprecated Locale classes

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The ICU component does not exist anymore, but the BC layer was still referencing it.

Commits
-------

eb0637f Fix the implementation of deprecated Locale classes