fix: don't generate report.html file for RC and Production

[mudassir-hafeez]

What are the relevant tickets?

#5265

Description (What does it do?)

This PR ensures that the report.html file generated by Webpack Bundle Analyzer is not served publicly in RC and Production environments. The file will now only be generated when the WEBPACK_ANALYZE environment variable is explicitly set to True during local development.

Screenshots (if appropriate):

• Desktop screenshots
• Mobile width screenshots

How can this be tested?

1. Local Testing:

   • Set WEBPACK_ANALYZE=True in your .env file to confirm that the report.html file is generated.
   • Run the webpack bundle with:
     node node_modules/webpack/bin/webpack.js --config webpack.config.prod.js --bail
   • Ensure that the report.html file is created under /static/bundles/.

2. Local Testing Without Analysis:

   • Remove or leave WEBPACK_ANALYZE unset, and confirm that the report.html file is not generated by running the same command as above.

3. RC/Production Testing:

   • After deploying the changes, verify that the report.html file is not publicly accessible in both environments:
   • https://rc.xpro.mit.edu/static/bundles/report.html
   • https://xpro.mit.edu/static/bundles/report.html

Additional Context

• The report file can still be generated locally for debugging purposes using the WEBPACK_ANALYZE flag.

[asadali145]

LGTM!