fix: Allow dynamic autoloading for classes added during upgrade

[ChristophWurst]

Fixes #5191

nextcloud/server#6853 + authoritative class loaders for apps distributed via the app store is problematic. Problem introduced with #4912.

What I have tested

• composer/autoload.php + authoritative class loader optimization: 💥 (main)
• composer/autoload.php + apcu class loader optimization: 😎
• composer/autoload.php + basic class map optimization: 😎 (here)
• no composer/autoload.php: 😎

To do

• Test that fails to load dynamically created classes
• Fix the autoloader config

How to test

1. Run composer i
2. composer run test tests/php/integration/Composer

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -8.51 ⚠️

Comparison is base (9ae057a) 22.38% compared to head (a75fad5) 13.88%.

❗ Current head a75fad5 differs from pull request most recent head c88cb60. Consider uploading reports for the commit c88cb60 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5295      +/-   ##
============================================
- Coverage     22.38%   13.88%   -8.51%     
============================================
  Files           238      201      -37     
  Lines         11617     9644    -1973     
  Branches       2253     2253              
============================================
- Hits           2601     1339    -1262     
+ Misses         9016     8305     -711     

Flag	Coverage Δ
javascript	13.88% <0.00%> (ø)
php	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/Editor/Invitees/InviteesList.vue	0.00% <0.00%> (ø)

... and 37 files with indirect coverage changes

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[ChristophWurst]

/backport to stable3.2

[GretaD]

/backport to stable4.4

[backportbot-nextcloud]

The backport to stable3.2 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable3.2
git pull origin stable3.2

# Create the new backport branch
git checkout -b fix/foo-stable3.2

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable3.2

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[ChristophWurst]

/backport to stable4.3