CPM-101: use symfony cache instead of doctrine cache

[nmarniesse]

Doctrine cache bundle is no longer maintained: doctrine/DoctrineCacheBundle#156

Since symfony 4.3 the best way to configure the cache is using the symfony/cache component. In this PR the doctrine-cache-bundle is removed and replaced by symfony/cache. The config is migrated to this new component.

Which configuration to use?

In our previous configuration we had

doctrine_cache:
    providers:
        pim_apcu:
            apcu: ~
        pim_array:
            array: ~
        pim:
            chain:
                providers: [doctrine_cache.providers.pim_apcu, doctrine_cache.providers.pim_array]

The default configuration in SF5 install is defined here: https://github.com/symfony/recipes/blob/master/doctrine/doctrine-bundle/1.6/config/packages/prod/doctrine.yaml
It seems simpler compared to our previous config with a simple and obscure cache.app:

framework:
    cache:
        pools:
            doctrine.result_cache_pool:
                adapter: cache.app
            doctrine.system_cache_pool:
                adapter: cache.system

So I adapt the symfony cache configuration to have the same behavior than before for results only:

framework:
    cache:
        pools:
            doctrine.result_cache_pool:
                adapters:
                    - cache.adapter.apcu
                    - cache.adapter.array
            doctrine.system_cache_pool:
                adapter: cache.system

The doctrine.system_cache_pool is different and used the default cache.system cache. Here is an explaination of this cache https://symfony.com/doc/current/cache.html#configuring-cache-with-frameworkbundle

Benchmarks in local

Load and force save 1239 products 5 times in the same process without clearing cache. The results are the same. The cost to fetch/save product from/in the cache is really low compared to the rest.

Duration in seconds	master	this PR
Pass 1	127	124
Pass 2	124	133
Pass 3	125	132
Pass 4	120	118
Pass 5	126	112
Average	124.4	123.8
Median	125	124