fix(Handler): no internal instance cache

For orders this is not needed. the internal instance cache causes more problems due to the mix between uuid and id cache. the internal cache on uuid / id was therefore removed. Orders have the data freshly fetched from the db anyway. therefore unnecessary. In addition, a wrong order object was repeatedly retrieved when sending mail.

added 2 commits

• e5d5466e - chore: phpstan baseline cleanup
• c276c1a8 - refactor: include cleanup

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mentioned in commit 17a5476d

merged

This MR is included in version 2.7.6

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