chore: Add tag-prefix for java-server-sdk release collection

[aaron-zeisler]

The java-core repo uses prefixed release tags (e.g. launchdarkly-java-server-sdk-7.8.0) but the metadata didn't specify a tag-prefix, so sdk-meta couldn't collect releases after 7.7.0.

Here's the related pull request in the sdk-meta repository: launchdarkly/sdk-meta#366

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

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Note

Low Risk
Low risk metadata-only change that affects how release tags are discovered for the Java Server SDK; no runtime code paths are modified.

Overview
Adds a releases.tag-prefix (launchdarkly-java-server-sdk-) to the java-server-sdk entry in .sdk_metadata.json so release collection can match prefixed git tags for this SDK.

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