fix tests after Symfony PropertyInfo update

[mringler]

With the current Symfony components, one test in the 5-max and and 6-max group fails, see for example this run.

Apparently, the Symfony PropertyInfo has changed internally, and now an assertion fails. A comment in the test acknowledges that it tests Symfony internals:

        $fictionMetadatas = $fictionMetadata->getPropertyMetadata('isbn');

        // 1st is for ValidateTriggerFiction (base)
        // 2nd is for ValidateTriggerBook (base)
        // I'm not sure if this is needed. We should not care about validator internals
        $this->assertCount(2, $fictionMetadatas);

Examining $fictionMetadatas, I can see that both ValidateTriggerFiction and ValidateTriggerBook are present in $fictionMetadatas[0].constraintsByGroup:

This is also successfully tested in the rest of the test case.

So apparently the PropertyInfo component now groups those constraints in the same PropertyMetadata object instead of using a new object for each. But this does not concern Propel. So we can just remove that assertion. We could also turn it into assertNotEmpty(), but that is tested implicitly in the next assertion.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -1.51 :warning:

Comparison is base (011aaa7) 88.56% compared to head (d2607c2) 87.05%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1973 +/- ## ============================================ - Coverage 88.56% 87.05% -1.51% Complexity 8051 8051 ============================================ Files 243 232 -11 Lines 24590 24544 -46 ============================================ - Hits 21777 21367 -410 - Misses 2813 3177 +364 ``` | Flag | Coverage Δ | | |---|---|---| | 5-max | `87.05% <ø> (-1.51%)` | :arrow_down: | | 7.4 | `87.05% <ø> (-1.51%)` | :arrow_down: | | agnostic | `67.44% <ø> (+0.14%)` | :arrow_up: | | mysql | `?` | | | pgsql | `69.81% <ø> (+0.70%)` | :arrow_up: | | sqlite | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=propelorm#carryforward-flags-in-the-pull-request-comment) to find out more. [see 35 files with indirect coverage changes](https://app.codecov.io/gh/propelorm/Propel2/pull/1973/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=propelorm)

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[floriankraemer]

I'll get this merged, it makes sense.