Fix OpenAPI Culture formatting for RangeAttribute and Unit Tests

[desjoerd]

Fix OpenAPI Culture formatting for RangeAttribute and Unit Tests

This is to fix unit tests and formatting issues when having a culture with , as decimal seperator.

Description

This is to fix unit tests and formatting issues when having a culture with , as decimal seperator. It fixes the range attribute by formatting it using the target locale. And the xml comment tests by using the FormattingStreamWriter as mentioned in:
microsoft/OpenAPI.NET#657 (comment).

Partially Fixes progress for #61965

[desjoerd]

@captainsafia I've created a PR which makes the failing unit tests green and should resolve a few formatting issues. (So I can make the fix for #61965)

I am partially doubting whether this PR is a good thing, yes it fixes the issue, and it should fix it for unit tests, but I think it hides an underlying issue (in Microsoft.OpenAPI) that it writes invalid json when the culture has a , and you don't use the FormattingWriter with CultureInfo.Invariant.

[desjoerd]

@dotnet-policy-service agree

[desjoerd]

@martincostello let me know if I need to change something or update my branch when the changes made in #62193 are merged.

[martincostello]

@desjoerd I updated #62193 to improve the tests, and now the test changes I made have repro'd the bug you're trying to fix here.

Would you mind if I pull your fix commit into my branch? Otherwise it's a bit chicken and egg as my branch can't be merged as another bug causes the tests that detect the bug I'm trying to fix to still fail. 😄

[desjoerd]

Feel free to do that :).

(Will I still get the first contribution credit 😜)

[martincostello]

Will I still get the first contribution credit

Of course!

[desjoerd]

When you've done it and give the 👍 I will close this PR.

[martincostello]

It's now included in #62193.