remove(git-source-settings.ts): workingDirectory option

Not needed (working-directory option is used internally)

src/git-source-settings.ts

@@ -108,9 +108,4 @@ export interface IGitSourceSettings {
    * User override on the GitHub Server/Host URL that hosts the repository to be cloned
    */
   githubServerUrl: string | undefined
-
-  /**
-   * User override of the working directory (default is $GITHUB_WORKSPACE)
-   */
-  workingDirectory: string | undefined
 }