[TASK] BackendEnvironment should not use deprecated config

[thomashohn]

Currently the BackendEnvironment use the 2 following deprecated configurations:

$localConfiguration['DB']['Connections']['Default']['tableoptions']['charset'] = 'utf8mb4';
$localConfiguration['DB']['Connections']['Default']['tableoptions']['collate'] = 'utf8mb4_unicode_ci';

Instead

$localConfiguration['DB']['Connections']['Default']['defaultTableOptions']['charset'] = 'utf8mb4';
$localConfiguration['DB']['Connections']['Default']['defaultTableOptions']['collation'] = 'utf8mb4_unicode_ci';

should be used. Since the is a silent migrations this works fine with TYPO3 13 - but will break with 14.
See:
https://forge.typo3.org/issues/105297
and
https://forge.typo3.org/issues/105495

[sbuerk]

Solved with #640 + #633. Closing issue.