build: update dependency webpack-dev-middleware to v8

[alan-agius4]

See associated pull request for more information.

Closes #32816 as a pr takeover

[gemini-code-assist]

Code Review

This pull request upgrades webpack-dev-middleware to version 8.0.2 and removes the _karma_webpack_ path prefix from Karma-related configurations, HTML templates, and middleware. The fallbackMiddleware was refactored for better efficiency using a Set for file lookups. Feedback was provided to refine a regular expression in the E2E tests to specifically target the webpack: protocol, ensuring the assertion is not overly broad and avoids potential false positives.

[alan-agius4]

This PR was merged into the repository. The changes were merged into the following branches:

• main: a5ab23e

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