Upgrade symfony to 5.4 & separate EntityMapper

[whikloj]

GitHub Issue: https://github.com/Islandora/documentation/issues/2220

Relies on

1. https://github.com/Islandora/chullo/pull/99
2. https://github.com/Islandora/Crayfish-Commons/pull/63

What does this Pull Request do?

• Upgrades Symfony from 4.4 to 5.4
• Pulls in the updated Crayfish-Commons
• Disables the ApixMiddleware from Homarus as we pass the URI to ffmpeg anyways
• Removes Crayfish-Commons dependency from Milliner and passes in chullo and fedora-entity-mapper
• Updates documentation

What's new?

• Does this change require documentation to be updated? Included
• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository (i.e. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? no

How should this be tested?

See the full build PR on islandora-playbook here (https://github.com/Islandora-Devops/islandora-playbook/pull/263)

Interested parties

Tag (@ mention) interested parties or, if unsure, @Islandora/committers

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.21 :warning:

Comparison is base (d4bc375) 76.93% compared to head (bafdd3b) 76.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 4.x #174 +/- ## ============================================ - Coverage 76.93% 76.72% -0.21% Complexity 160 160 ============================================ Files 6 6 Lines 711 782 +71 ============================================ + Hits 547 600 +53 - Misses 164 182 +18 ``` [see 6 files with indirect coverage changes](https://app.codecov.io/gh/Islandora/Crayfish/pull/174/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Islandora)

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[whikloj]

Thinking about this I decided to make a new 4.x branch as this changes the version of Symfony and as such would not be a simple overlay. It will require changes to your configuration which I may have to write.