Sync PersistenceMapKeyDiagnostics and Websocket quick fix JDT changes from lsp4Jakarta

[Joseph-Bineesh]

Replicate the following changes from lsp4jakarta JDT changes to IntelliJ

• Investigate whether diagnostics should be applied to all methods in PersistenceMapKeyDiagnosticsParticipant. eclipse-lsp4jakarta/lsp4jakarta#532 - Access specifier diagnostic
• Investigate whether diagnostics should be applied to all methods in PersistenceMapKeyDiagnosticsParticipant. eclipse-lsp4jakarta/lsp4jakarta#532 - Method or Field type diagnostic
• WebSocket: Add Quick-Fix for ServerEndpoint paths without a leading slash eclipse-lsp4jakarta/lsp4jakarta#284 - QuickFix for ServerEndpoint paths without a leading slash

[Joseph-Bineesh]

All the changes are completed and got approvals.
Note: PR raised to branch : [OpenLiberty:lsp4jakarta-0.2.5-integration]