fix(profiles): fix vscode profile generation (#1027)

* fix(profiles): fix vscode profile generation

- Add .instructions.md extension for VSCode Copilot instructions file.
- Add customReplacement to remove unsupported property `alwaysApply` from YAML front-matter in VSCode instructions files.
- Add missing property `targetExtension` to the base profile object to
  support the change to file extension.

* chore: run format

---------

Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

src/profiles/base-profile.js

@@ -234,6 +234,7 @@ export function createProfile(editorConfig) {
 		globalReplacements: baseGlobalReplacements,
 		conversionConfig,
 		getTargetRuleFilename,
+		targetExtension,
 		// Optional lifecycle hooks
 		...(onAdd && { onAddRulesProfile: onAdd }),
 		...(onRemove && { onRemoveRulesProfile: onRemove }),