Fix query params and regional routing in emulated HTTP functions

[samtstern]

Description

Fixes #3031
Fixes #3032

Scenarios Tested

const functions = require("firebase-functions");
const express = require('express');

const server = express();
server.get('/', (req, res) => {
    res.send('lol!');
});

exports.helloWorld = functions.https.onRequest((req,res) => {
    res.json(req.query);
});

exports.api = functions.region('europe-west3').https.onRequest(server);

For #3032

$ http "http://localhost:5001/fir-dumpster/us-central1/helloWorld"
HTTP/1.1 200 OK
connection: keep-alive
content-length: 2
content-type: application/json; charset=utf-8
date: Thu, 14 Jan 2021 14:19:19 GMT
etag: W/"2-vyGp6PvFo4RvsFtPoIWeCReyIC8"
keep-alive: timeout=5
x-powered-by: Express

{}

$ http "http://localhost:5001/fir-dumpster/us-central1/helloWorld?id=ok"
HTTP/1.1 200 OK
connection: keep-alive
content-length: 11
content-type: application/json; charset=utf-8
date: Thu, 14 Jan 2021 14:19:09 GMT
etag: W/"b-O3GjgUzPF1NwRnSW+tWJECMBW0k"
keep-alive: timeout=5
x-powered-by: Express

{
    "id": "ok"
}

$ http "http://localhost:5001/fir-dumpster/us-central1/helloWorld/?id=ok"
HTTP/1.1 200 OK
connection: keep-alive
content-length: 11
content-type: application/json; charset=utf-8
date: Thu, 14 Jan 2021 14:19:02 GMT
etag: W/"b-O3GjgUzPF1NwRnSW+tWJECMBW0k"
keep-alive: timeout=5
x-powered-by: Express

{
    "id": "ok"
}

$ http "http://localhost:5001/fir-dumpster/us-central1/helloWorld/?foo=bar&baz=quz"
HTTP/1.1 200 OK
connection: keep-alive
content-length: 25
content-type: application/json; charset=utf-8
date: Thu, 14 Jan 2021 14:18:48 GMT
etag: W/"19-aJ5/6qdD+JUaYGoi+SY23wQdu+Y"
keep-alive: timeout=5
x-powered-by: Express

{
    "baz": "quz",
    "foo": "bar"
}

For #3031

$ http http://localhost:5001/fir-dumpster/europe-west3/api
HTTP/1.1 200 OK
connection: keep-alive
content-length: 4
content-type: text/html; charset=utf-8
date: Thu, 14 Jan 2021 15:25:01 GMT
etag: W/"4-aGtZBCd1zhmF98IwfKTshS0CjO4"
keep-alive: timeout=5
x-powered-by: Express

lol!

Sample Commands

N/A

[coveralls]

Coverage decreased (-0.01%) to 65.538% when pulling dd15ae3 on ss-fix-3032 into b26aa46 on master.

[samtstern]

@bkendall something is not right with Coveralls, I added a unit test and changed one line which is covered by that test and my coverage decreased?