[HttpFoundation] Update QUERY_STRING when overrideGlobals
[Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
bug #11408 [HttpFoundation] Update QUERY_STRING when overrideGlobals (yguedidi)

This PR was merged into the 2.3 branch.

Discussion
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[HttpFoundation] Update QUERY_STRING when overrideGlobals

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

Commits
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777666f [HttpFoundation] Update QUERY_STRING when overrideGlobals
[HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field
feature #11510 [HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field (catchamonkey)

This PR was squashed before being merged into the 2.3 branch (closes #11510).

Discussion
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[HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11508
| License       | MIT
| Doc PR        | no

ToDo

 * [x] Fix Tests

Looking for feedback on this early PR.

This adds a config option that disables the PHP GC method call from doing anything,
It also means that the write method sets up the auto expiring index.

Ref: #11508

Commits
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b56b740 [HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field
bug #11559 [Validator] Convert objects to string in comparison validators (webmozart)

This PR was merged into the 2.3 branch.

Discussion
----------

[Validator] Convert objects to string in comparison validators

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

In the [latest merge from 2.3 into 2.4](/symfony/symfony/commit/3bed1b7988e94a897a64c6a2ad3bf70bde9005c1), the changes from 6cf5e0812e6f20d60acbc0324abf96475e89b6ef in 2.4 got lost. This PR brings back these changes and backports them to 2.3.

The change is BC, because the former value `true` of the `$prettyDateTime` will be cast to `1`, which corresponds to the `PRETTY_DATE` format constant.

Commits
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273671e [Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
Fix toolbar vertical alignment.
bug #11641 [WebProfilerBundle ] Fix toolbar vertical alignment (blaugueux)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11641).

Discussion
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[WebProfilerBundle ] Fix toolbar vertical alignment

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

Fix the vertical alignment of texts in the toolbar.

This issue appears when a reset css contain ```vertical-align: top/bottom/middle;```

Commits
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65220e7 Fix toolbar vertical alignment.