Update issue templates

.github/ISSUE_TEMPLATE/deprecation-notice-for-new-issues.md

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+---
+name: Deprecation notice for new issues
+about: 'WARNING: signalfx-java is now deprecated'
+title: "[DEPRECATED] Question about signalfx-java"
+labels: ''
+assignees: ''
+
+---
+
+The signalfx-java repository is deprecated as of February 1st, 2024. It will reach end of support (EOS) in perpetuity on February 1st, 2025 and will be archived.
+
+The only patches considered for this repository are security related. 
+
+Please feel free to continue opening this issue if one of the following applies:
+
+* You have a security question or concern
+* You have a question about an existing feature
+* You have a question about the deprecation