chore(cts): replace localhost at runtime

[millotp]

🧭 What and Why

Because network=host doesn't work properly on mac, we need to use host.docker.internal locally and localhost on the CI.
Instead of generating the tests with the correct host, we can guess it at runtime based on the CI var env, this means we don't need to generate the tests anymore to run locally, the same code can run anywhere now !

Kotlin and ruby are a bit of a pain because the error message also contains the address, but we can replace it too.
I add to use a weird %localhost% otherwise mustache interprets it as a variable, or kotlin interprets it as a regex reference.

[algolia-bot]

✔️ Code generated!

Name	Link
🪓 Triggered by	be2e708d51a6a699d558cfd34cbf7c81784d128e
🍃 Generated commit	fcbc5f79656ba7e20418c0d8077520b24f820574
🌲 Generated branch	generated/chore/localhost

📊 Benchmark results

Benchmarks performed on the method using a mock server, the results might not reflect the real-world performance.

Language	Req/s
javascript	1877
php	1581
go	1472
csharp	1306
java	1150
python	1071
ruby	921
swift	777

[Fluf22]

That's so kind of you to have implemented this!
It was so much painful to have to edit it manually

[millotp]

It was so much painful to have to edit it manually

it would have been better to have a proxy or something but I didn't manage to make it work, this will do for now

[shortcuts]

never had an issue with the previous implem but this one looks good too, nice :)