Update kolibri-format and eslint-plugin-kolibri and resolve new VTL tests linter failures

[MisRob]

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Complexity: Medium

Target branch: unstable

Blocks

#5789

Overview

• Install latest version of kolibri-format and eslint-plugin-kolibri
• Resolve lint failures

Related docs:

• Reference translation keys, not hardcoded strings
• Avoid using stubs

Related Kolibri PR learningequality/kolibri#14579

AI usage

None