Fix share permalink as markdown to use filename when invoked from tab context menu

[Copilot]

"Copy GitHub Permalink as Markdown" from file tab context menu incorrectly uses the text at cursor position instead of the filename for the link text.

Changes

• Modified copyMarkdownPermalink in src/issues/issueFeatureRegistrar.ts to detect invocation source
• When context is a vscode.Uri (tab context menu): use filename
• When context is an EditorLineNumberContext (gutter click): preserve existing behavior using selection text

const firstContext = context.length > 0 ? context[0] : undefined;
const contextIsFromTab = firstContext instanceof vscode.Uri;

if (withPermalinks.length === 1 && !contextIsFromTab) {
    const selection = this.getMarkdownLinkText(withPermalinks[0].range);
    // ... use selection text
}
// Otherwise use filename

Original prompt

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This section details on the original issue you should resolve

<issue_title>Share permalink as markdown on tab should use filename for link text</issue_title>
<issue_description>Testing microsoft/vscode#177486

open a file and place your cursor somewhere in that file
right click the file tab and 'share github permalink as markdown`
🐛 the generated link will use the text at the cursor location, but seems like it should just be the filename
if the cursor isn't in that file, then the text seems to be picked up from its last location, possibly from another window</issue_description>

<agent_instructions>Pay special attention to #4663 (comment)</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@amunger the command will use the line as text when the editor is focused, and the filename if the editor is not focused.

• Fixes Share permalink as markdown on tab should use filename for link text #4663

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