Fixes Microsoft/monaco-editor#425: Create an aria container dom node as soon as the first editor is instantiated

Does not change any behavior

fixes #28143

fixes #28014

fixes #27856

fixes #27979

fixes #27389

itroduced in https://github.com/Microsoft/vscode/commit/8f9dc8e220aef53c19ef9dfa7284689e04080a0d#diff-0e25f213bdb14a7f0c59d148e40f02f5R256 and https://github.com/Microsoft/vscode/commit/8faa03f88573dbf4b0f5a5a6b583436319d836a8#diff-0e25f213bdb14a7f0c59d148e40f02f5R256