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chore: upgrade ESLint to v9 and migrate to flat config

This PR upgrades ESLint to v9 and migrates the project configuration
to the new flat config system.

The following ESLint-related packages were upgraded:
`npm install
eslint@9
@typescript-eslint/eslint-plugin@latest
@typescript-eslint/parser@latest
eslint-plugin-react-hooks@latest
eslint-plugin-react-refresh@latest
eslint-plugin-testing-library@latest`

ESLint 9 introduces several breaking changes. The most significant one
is that the flat config is now the default configuration format.
Instead of using multiple configuration sources such as .eslintrc.*
files, ESLint now relies on a single configuration file
(eslint.config.js / .cjs / .mjs)

The existing configuration was migrated using the official
ESLint migrator:

`npx @eslint/migrate-config .eslintrc.cjs`

This tool converts the legacy .eslintrc configuration into the new flat
config format and generates the initial eslint.config file

The following package was also installed to help maintain compatibility
with plugins that do not fully support the flat config yet:
`npm install @eslint/compat`

Signed-off-by: Jasmina <jasmina.piric@secomind.com>

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