feat(TKC-6726): Use license identity for cli init demo telemetry

[Valentin-Marko]

Pull request description

testkube init demo now validates the license against license.testkube.io/validate before installing, and uses the license name as the telemetry user ID for the demo onboarding events instead of the environment ID.

Checklist (choose whats happened)

• breaking change! (describe)
• tested locally
• tested on cluster
• added new dependencies
• updated the docs
• added a test

Breaking changes

Changes

• init demo calls the license /validate endpoint at the "license validated" step. On a definitive "invalid" response it fails fast with a clear Invalid license key error (before the multi-minute Helm install); a network/transport error is non-fatal and the install proceeds (the control plane remains the authoritative gate).
• The demo telemetry (testkube_init_demo) now sends the license name from the validate response as the userId for the steps from license validated onward, replacing the environment ID. sendTelemetry gained an optional userID override so the dashboard command is unaffected.
• Removed the redundant local license format check (length / key/ prefix) and its now-unused licenseFormat const — validation is handled by /validate.

Fixes

[testkubebot]

✅ Testkube GitHub Integration

Review based on commit ba44845.

All tests and quality gates passed.

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Phase	Status
Test Workflow Execution	✅ Passed
Quality Gate	✅ Passed

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7 workflows executed

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Manage this Integration

[Valentin-Marko]

@greptileai please review

[greptile-apps]

Greptile Summary

The PR validates demo licenses before installation, uses the validated license identity for subsequent onboarding telemetry, and adds a ten-second request deadline that resolves the previously reported validation hang.

• Invalid licenses now fail before Helm installation.
• Validation transport failures remain non-fatal.
• Dashboard telemetry retains its existing user identity behavior.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
cmd/kubectl-testkube/commands/init.go	Adds pre-install license validation and applies the returned license name as the demo telemetry identity while preserving the non-fatal transport-error path.
pkg/diagnostics/validators/license/client.go	Adds a request-scoped ten-second deadline that bounds the HTTP request and response-body processing.

_{Reviews (3): Last reviewed commit: "fix: add timeout to license validation r..." | Re-trigger Greptile}

[Valentin-Marko]

@greptileai please review again