[gitlab-org/gitlab] Skip license compliance polling while MR pipeline is active

### ROOT CAUSE The `LicenseComplianceProvider` currently starts fetching license compliance data immediately on mount, regardless of whether the MR pipeline is still running. This leads to unnecessary polling requests and a less informative loading state compared to the `SecurityScansProvider`, which checks if the pipeline is active and skips fetching or shows a more informative message. ### CODE FIX To address this issue, we need to add the same `isPipelineActive` check to the `LicenseComplianceProvider` to defer fetching data until the pipeline is complete. Additionally, we will provide a computed `loadingMessage` to display an informative message when the pipeline is active. Here is the proposed fix: 1. **Add `isPipelineActive` check in `license_compliance_provider.vue`:**

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2. **Provide the `loadingMessage` to consuming components:**

If the `LicenseComplianceProvider` is used in a parent component, the parent component can access the `loadingMessage` and display it accordingly.

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By implementing these changes, the `LicenseComplianceProvider` will defer fetching data until the pipeline is complete, reducing unnecessary polling requests and providing a more informative loading message. This aligns the behavior with the `SecurityScansProvider` for consistency.