fix(ci): update template with upstream

[bdellegrazie]

Align the action template with typescript-action template

[Copilot]

Pull request overview

This PR aligns the repository’s GitHub Action template with the upstream typescript-action template by consolidating TypeScript configuration, updating tooling/dependencies, and adjusting CI/workflows.

Changes:

• Inlines tsconfig.base.json into tsconfig.json and removes tsconfig.base.json / tsconfig.eslint.json.
• Updates build/lint/test tooling (Rollup sourcemaps off, ESLint config changes, Jest now uses tsconfig.json).
• Updates CI workflows (Checkov config wiring, dist cleanup before rebuild, small workflow comment formatting).

Reviewed changes

Copilot reviewed 10 out of 15 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tsconfig.json	Moves previously-shared compiler options into the main TS config.
tsconfig.eslint.json	Removes the dedicated ESLint TS project config.
tsconfig.base.json	Removes the shared base TS config (options moved into tsconfig.json).
rollup.config.ts	Disables sourcemap generation in Rollup output.
package.json	Updates dependencies/tooling and adjusts packaging to clean dist/ first.
jest.config.js	Switches ts-jest to use tsconfig.json.
eslint.config.mjs	Updates flat-config setup and TypeScript parser options; removes import plugin wiring.
.github/workflows/linter.yml	Adds Checkov config filename and tweaks Checkov enablement line.
.github/workflows/ci.yml	Comment-only whitespace/formatting adjustments.
.github/workflows/check-dist.yml	Cleans dist/ before rebuilding and diffing.
.devcontainer/devcontainer.json	Removes an extension entry.
.checkov.yml	Adds a Checkov configuration file.

Comments suppressed due to low confidence (1)

eslint.config.mjs:33

• eslint.config.mjs still configures import/*, eslint-comments/*, and i18n-text/* rules, but those plugins are not registered in plugins and are not present in package.json. ESLint will error with “Definition for rule … was not found” even when the rule is set to off. Either re-add and register the required plugins, or remove these rule entries.

    plugins: {
      jest,
      prettier,
      '@typescript-eslint': typescriptEslint
    },