docs(apm): bump @nais/apm docs to v0.6.0

[github-actions]

Bumps the pinned @nais/apm version references in the docs from
0.4.0 to 0.6.0.

Release: https://github.com/nais/apm/releases/tag/apm-v0.6.0

This updates every @nais/apm@<semver> install snippet under
docs/observability/** and the nais-apm-version marker in
docs/observability/apm/reference/apm-client-api.md.

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Opened automatically by the nais-apm-docs-version-sync workflow.

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[Copilot]

Pull request overview

Updates the observability documentation to pin @nais/apm installation snippets to the newly released 0.6.0, keeping the docs aligned with the latest published SDK version.

Changes:

• Bumped @nais/apm@<semver> install snippets under docs/observability/** from 0.4.0 to 0.6.0.
• Updated the nais-apm-version marker in the APM client API reference to 0.6.0.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/observability/frontend/how-to/quickstart-react-vite.md	Updates install snippet pin to @nais/apm@0.6.0.
docs/observability/frontend/how-to/quickstart-nextjs.md	Updates install snippet pin to @nais/apm@0.6.0.
docs/observability/frontend/how-to/migrate-from-sentry.md	Updates install snippet pin to @nais/apm@0.6.0.
docs/observability/apm/tutorials/track-frontend-errors.md	Updates install snippet pin to @nais/apm@0.6.0.
docs/observability/apm/reference/apm-client-api.md	Updates the nais-apm-version marker to 0.6.0.

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