fix(dev): Do not change origin on proxy in dev

[dac09]

Fixes #7811

What does this do?

See issue for an explanation, but in essence:

1. Allows any host to connect (localhost, 127.0.0.1, myCustom.host) by setting host to true https://vitejs.dev/config/server-options.html#server-host

2. Does not change the origin when proxying requests to the api side.

---

Incase there's interest to try this, this is the api function I used to debug (based on issue instructions):

import type { APIGatewayEvent, Context } from 'aws-lambda'

import { logger } from 'src/lib/logger'

export const handler = async (event: APIGatewayEvent, _context: Context) => {
  logger.info(`${event.httpMethod} ${event.path}: checkHost function`)

  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      host: event.headers.host,
    }),
  }
}

[thedavidprice]

@dac09 is there direction for testing/QA here? E.g for a reviewer how could someone confirm this does not break behavior?

Please loop in either Josh or Tobbe for review. Thanks!

[dac09]

@dac09 is there direction for testing/QA here? E.g for a reviewer how could someone confirm this does not break behavior?

Yep in the description of this PR and the original issue :)

@Tobbe, @Josh-Walker-GM review please?

[Josh-Walker-GM]

Looks good and testing locally worked great.