fix(components): 194 - Fixed LengthMeasurement bug while UI Disabled.

[HoyosJuan]

Description

This PR solves issue #194. The problem was the VertexPicker was taking the viewer container from the UI Manager, but the UI Manager never gets initialized if the developer decides to disable the built-in UI by using components.uiEnabled = false.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following:

• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Follow the Conventional Commits v1.0.0 standard for PR naming (e.g. feat(examples): add hello-world example).
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.