chore: downmerge the archive-doc-gen package upgradation changes.

[VishalS-Microsoft]

Purpose

This pull request primarily downgrades several dependencies across the frontend and backend of the archive-doc-gen project to earlier versions, likely to address compatibility or stability concerns. Additionally, it updates a workflow environment variable for notification jobs.

Dependency version downgrades and environment updates:

Frontend (package.json):

• Downgraded multiple dependencies and devDependencies, including react, react-dom, @fluentui packages, lodash, undici, react-router-dom, react-syntax-highlighter, and various ESLint and testing packages, to earlier versions.

Backend (requirements.txt and requirements-dev.txt):

• Downgraded several Python dependencies such as openai, azure-storage-blob, azure-cosmos, aiohttp, gunicorn, black, and several opentelemetry packages to previous versions.
• Downgraded development dependencies including Markdown, tqdm, langchain, urllib3, and black for consistency with the main requirements. [1] [2]

CI/CD Workflow:

• Updated the accelerator_name environment variable in .github/workflows/job-send-notification.yml from "DocGen" to "ContentGen".

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

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