Upgrade to LSP4Jakarta 0.2.6

[dessina-devasia]

Upgrade to LSP4Jakarta 0.2.6

Smoke test plan: https://ibm.ent.box.com/notes/1710837321166

• Perform Smoke test LTI main with LSP4Jakarta 0.2.6-SNAPSHOT
• Perform FVT for Changes Introduced in LSP4Jakarta 0.2.6 #1616
• Merge PR from OpenLiberty:lsp4jakarta-0.2.6-integration-branch to main
• Upgrade LSP4Jakarta version to 0.2.6-SNAPSHOT
• Perform smoke test
• Upgrade to LSP4Jakarta 0.2.6 in LTI main, once LSP4Jakarta 0.2.6 releases