refactor: remove GitHub panic error reporter

[Sheng Chen (jdneo)]

We never use/observe this reporter, remove it.

[Copilot]

Pull request overview

Removes the legacy “GitHub panic” error reporter path and relocates the only remaining helper (computeFileName) into the telemetry DTO, keeping exception telemetry generation self-contained in the LSP protocol layer.

Changes:

• Removed GithubPanicErrorReport and all wiring from CopilotCore and proxy/settings sync.
• Moved filename derivation logic into TelemetryExceptionParams and improved handling for missing source filenames.
• Added unit tests to validate telemetry filename derivation behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/preferences/LanguageServerSettingManager.java	Stops updating the removed panic reporter on proxy/settings changes.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/TelemetryExceptionParams.java	Inlines filename computation and removes dependency on the deleted reporter.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/logger/GithubPanicErrorReport.java	Deletes the legacy panic error reporter implementation.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/CopilotCore.java	Removes reporter lifecycle/fallback usage from exception reporting.
com.microsoft.copilot.eclipse.core.test/src/com/microsoft/copilot/eclipse/core/lsp/protocol/TelemetryExceptionParamsTests.java	Adds coverage for filename computation in telemetry payloads.