EDU-4357: Prototypes language tabs (DO NOT MERGE)

[fairlydurable]

• Adds streamlined React component tooling to simplify language-specific content
• Uses opt-in content. Adds placeholders for languages whose content hasn't yet been created
• Uses global shared group so tab selection is preserved throughout page and site
• Can add that content in any order, although canonical order is preferred
• Sample deployed to: /cloud/deploy-workers-to-aws-eks

For example:

import { LANGUAGE_TAB_GROUP, getLanguageLabel } from '@site/src/constants/languageTabs';
import SdkTabs from '@site/src/components';

<SdkTabs>
<SdkTabs.Python>
```python
TEMPORAL_ADDRESS = os.environ.get("TEMPORAL_ADDRESS", "localhost:7233")
TEMPORAL_NAMESPACE = os.environ.get("TEMPORAL_NAMESPACE", "default")
TEMPORAL_TASK_QUEUE = os.environ.get("TEMPORAL_TASK_QUEUE", "test-task-queue")
TEMPORAL_API_KEY = os.environ.get("TEMPORAL_API_KEY", "")
```
</SdkTabs.Python>
</SdkTabs>

[fairlydurable]

@axfelix Looks like dprint wants to flatten all my code-fenced items inside my tab groups. :(