fix: correct handling of additionalProperties in object schemas

[bradzacher]

PR Checklist

• Steps in Contributing were taken

Overview

@domdomegg's #6894 made me realise I'd incorrectly handled this case in the schema gen.
When it's missing/undefined it's the same as being true - but I treated it as false

[typescript-eslint]

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✅ Successfully ran 32 targets

• Node 18 - nx test eslint-plugin
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• Node 18 - nx test type-utils
• Node 18 - nx test scope-manager
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• nx run-many --target=typecheck --parallel
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• Node 14 - nx test ast-spec --coverage=false
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• Node 18 - nx test parser
• Node 14 - nx test scope-manager --coverage=false
• Node 18 - nx test eslint-plugin-tslint
• Node 18 - nx test eslint-plugin-internal
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• Node 14 - nx test type-utils --coverage=false
• Node 14 - nx test rule-schema-to-typescript-types --coverage=false
• Node 18 - nx test ast-spec
• Node 14 - nx test visitor-keys --coverage=false
• Node 14 - nx test utils --coverage=false
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint

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[codecov]

Codecov Report

Merging #6939 (223624d) into v6 (acc1a43) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##               v6    #6939      +/-   ##
==========================================
- Coverage   87.51%   87.50%   -0.01%     
==========================================
  Files         376      376              
  Lines       12944    12936       -8     
  Branches     3821     3820       -1     
==========================================
- Hits        11328    11320       -8     
  Misses       1231     1231              
  Partials      385      385              

Flag	Coverage Δ
unittest	87.50% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
packages/eslint-plugin/src/rules/array-type.ts	97.14% <ø> (ø)
packages/eslint-plugin/src/rules/ban-ts-comment.ts	96.96% <ø> (ø)
...plugin/src/rules/naming-convention-utils/schema.ts	100.00% <ø> (ø)
...ges/eslint-plugin/src/rules/no-misused-promises.ts	97.47% <ø> (ø)
...-plugin/src/rules/no-unnecessary-type-assertion.ts	94.59% <ø> (ø)
...int-plugin/src/rules/require-array-sort-compare.ts	87.50% <ø> (ø)
...-plugin/src/rules/restrict-template-expressions.ts	100.00% <ø> (ø)
.../eslint-plugin/src/rules/sort-type-constituents.ts	90.38% <ø> (ø)
packages/eslint-plugin/src/rules/typedef.ts	96.00% <ø> (ø)

... and 1 file with indirect coverage changes

[armano2]

good catch 👍