fix(amazonq): adding openTabFilepaths to inline completion requests

[laileni-aws]

Problem:

Eclipse plugin was not sending openTabFilepaths in inline completion requests to the language server. The LS protocol defines this optional field (OpenTabParams.openTabFilepaths?: string[]) and the LS already consumes it in getCrossFileCandidates() to build supplemental context from open editor tabs — but Eclipse never populated it. VSCode has been sending this field (via getOpenFilesInWindow()), giving it a richer cross-file context pool for code suggestions. Without it, Eclipse's inline completions relied only on files the LS knew about via didOpen/didClose notifications and the local project context index, resulting in poorer suggestion quality for proprietary APIs where the model needs to see class definitions from other open files.

Solution:

Three source changes in the Eclipse plugin (no LS changes needed):

1. InlineCompletionParams.java — Added openTabFilepaths field (List<String>) matching the LS protocol's OpenTabParams interface.

2. QEclipseEditorUtils.java — Added getOpenEditorFilePaths() that iterates IWorkbenchPage.getEditorReferences(), extracts OS file paths from each editor input, and skips in-memory editors. Returns raw file paths (not URIs), which is what the LS expects in getCrossFileCandidates() via URI.file(openTabFile).

3. InlineCompletionUtils.java — Updated cwParamsFromContext() to call getOpenEditorFilePaths() and set the result on params when non-empty.

Two test files added: InlineCompletionUtilsTest.java and QEclipseEditorUtilsGetOpenEditorFilePathsTest.java covering the happy path, empty list, in-memory editor skipping, unresolvable editors, and null active page scenarios.

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