tarantool / tarantool / 21247454850 / 1

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config: validate permissions in credentials

This patch fixes a bug where config:reload() crashes if a
credentials.users.<username>.privileges entry misses the `permissions`
field, leading to:

NOWRAP
```
credentials.lua:207: bad argument #1 to 'ipairs' (table expected, got nil)
```
NOWRAP

This patch adds validation that requires `permissions` in each
privileges entry and reports a configuration error instead of crashing.

Closes #11441

NO_DOC=bugfix
NO_CHANGELOG=bugfix

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